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            • 1.
              1.1×3.3×9.9+3×9×27+
              1
              5
              ×
              3
              5
              ×
              9
              5
              1.1×2.2×4.4+3×6×12+
              1
              5
              ×
              2
              5
              ×
              4
              5
            • 2. 试算出下列各式之值:
              4444×9999÷6666=
              1
              20
              ×16-
              1
              20
              ×8+
              1
              20
              ×4-
              1
              20
              ×2=
              1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷(6÷7)÷(7÷8)=
              12345-(1234+2345)=
              0.125×0.25×64×0.5=
              2010×20092009-2009×20102010=
              79999+7999+799+79+24=
              4
              5
              ×125
              1-(
              3
              4
              +
              1
              12
              )
              =
              10%÷20×30÷40%=
              1
              1-
              1
              θ
              =3,θ=
            • 3.
              1+0.5
              3
              4
              -0.75
              +
              3×0.5
              1
              1
              2
              +3
            • 4.
              (2
              38
              45
              -
              1
              15
              )÷13
              8
              9
              +3
              3
              65
              ×
              26
              99
              (18.5-13
              7
              9
              1
              85
            • 5. 用递等式计算
              [(1
              2
              3
              ×2+25)÷
              7
              8
              -2
              1
              5
              ]÷1.6


              (1
              1
              2
              +2
              1
              4
              5
              7
              4
              9
              ×(1
              1
              8
              -
              4
              5
              )


              [20-(1
              5
              12
              +1
              1
              2
              )×5
              1
              7
              ]÷120%


              [(11
              11
              28
              +3
              13
              14
              -12
              6
              7
              15
              28
              +20.1]÷123.5


              4780×99-(476.4×284+4764×71.6)÷1
              1
              99
            • 6. 计算题.
              1
              12
              +(4
              5
              12
              -3
              1
              2
              )÷
              11
              24

              (8
              5
              8
              -10.5×
              4
              5
              )÷4
              1
              3

              2
              7
              20
              ÷[5
              3
              4
              -4.5×(20%+
              1
              3
              )]
              9
              2
              :x=2
              4
              7
              :0.5
              2
              5
              9
              +3
              9
              10
              -5.22
              2
              5
              9
              -6
              27
              50
              +5.22
              +(
              2006×0.4
              2008×0.5
              +
              16
              2008

              1
              1+2
              +
              1
              1+2+3
              +
              1
              1+2+3+4
              +…+
              1
              1+2+3+…+50
            • 7. (1)42÷
              3
              7
              +(8.8-
              8
              11
              )×1.25                 
              (2)求x:(1
              2
              3
              +8
              1
              5
              ):x=
              2
              15
              5
              9

              (3)
              1
              8
              13
              ×
              13
              42
              +
              4
              5
              -
              4
              5
              6
              1
              8
              -4
              1
              2
                                  
              (4)5-[1
              1
              3
              -(2
              1
              2
              -1
              1
              3
              )]÷0.125.
            0/40

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