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            • 1. 脱式计算
              10
              21
              -
              8
              21
              -
              2
              21

              7
              10
              +
              7
              10
              -
              3
              10

              (1-(
              9
              16
              +
              5
              16

              5.4÷[2.5×(3.7-2.9)].
            • 2. 直接写得数.
              3.14×20=
              1
              5
              +
              1
              5
              =
              1+
              4
              7
              -
              3
              7
              =
              1
              8
              +
              3
              8
              )×24=
              0.15×100=54÷
              9
              5
              =
              12.5×8=99×0.6+0.6=
            • 3. 直接写得数.
              5
              6
              +
              3
              4
              5
              6
              -
              3
              4
              5
              6
              ×
              3
              4
              5
              6
              ÷
              3
              4
              2
              9
              ×0.6﹦
              5
              8
              ×
              4
              15
              ×0﹦
              5
              8
              1
              3
              ×
              1
              4
              ÷
              1
              3
              ×
              1
              4
            • 4. 怎样简便怎样计算.
              1
              8
              ×
              3
              4
              +0.125×
              1
              4
               
              48×
              12
              47
              5
              18
              ×26×
              1
              9
              1.6×
              2
              5
              +
              3
              5
              ÷
              5
              8
               
              9
              11
              +
              8
              9
              )×99 
              1-
              5
              8
              ÷
              25
              24
              -
              3
              10
            • 5. 直接写出得数.
              5÷(1+
              1
              4
              )=
              12×0.5=0.75×
              4
              5
              =
              1-1×
              3
              4
              =
              1
              4
              +
              1
              5
              ×
              1
              4
              =
              24÷
              2
              3
              =
              2
              3
              ×0.25=
              1
              5
              +
              1
              7
              =
            • 6. 计算
              3
              5
              ×
              5
              27
              ×
              9
              10

              15
              16
              ÷
              5
              8
              ×
              3
              4

              7
              8
              ÷10÷
              14
              15
            • 7. 直接写出得数.
              3
              5
              ×
              1
              2
              =
              1
              2
              ÷3=
              1
              3
              -
              1
              4
              =
              3
              8
              ÷
              3
              2
              =
              3
              4
              -
              3
              8
              -
              3
              16
              =
              5
              6
              =
              7
              12
              ÷
              7
              4
              =
              6.3÷0.7=
              1
              2
              +
              1
              5
              =
              8
              21
              ÷
              2
              7
              =
              28×
              1
              14
              =
              5+
              5
              11
              =
            • 8. 怎样简便就怎样算.
              15×
              4
              5
              ÷
              6
              7
                         
              3
              4
              ÷6÷
              7
              8

              24×(
              3
              8
              +
              1
              4
              -
              1
              6
              )       
              2
              3
              ÷
              4
              3
              -
              2
              3
              ×
              3
              4
            • 9. 直接写出得数.
              1.2×
              1
              6
              =
              125%×8=4.8÷0.8=
              4
              5
              =
              12×(
              1
              4
              +
              1
              6
              )=
              1-1÷9=
              2
              3
              -
              2
              3
              ×0=
              2.5×3.5×0.4=
            • 10. 计算下列各题,能简算的要写出简算过
              4
              7
              ×
              5
              9
              +
              3
              7
              ×
              5
              9
              (14+
              7
              2
              )×
              1
              28
              13÷[(1+
              1
              3
              )×
              3
              4
              ]
              2×(3.8-
              4
              5
              )÷(
              5
              8
              -
              3
              8
              9
              2
              ÷[
              6
              5
              ×(
              1
              2
              +
              3
              4
              )]
              (0.75+
              1
              8
              )×(
              2
              7
              -
              1
              14
            0/40

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