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            • 1. 直接写出得数.
              3
              4
              ×
              2
              3
              =
              0.32-0.23=
              5
              8
              ×16=
              5
              4
              ×
              4
              5
              =
              0.23=
              1
              2
              +
              3
              8
              =
              9
              10
              ÷
              3
              5
              =
              1÷3÷4=
            • 2. 直接写得数:
              0.83=26.26÷26=16+47=
              4.3-2.13=
              1
              4
              +
              1
              3
              =
              5
              7
              -
              2
              7
              =
            • 3. 直接写得数.
              7x+4x=92=23×4=125×1.6=
              6x-3x=0.8×0.4=1.5×6=7.8÷3=
              15×4=99÷0.1=1.32×6=9.6÷3=
              3×0.8=2a-2a=2.5×0.4=7.5÷5=
            • 4. 直接写出得数
              33=
              4
              25
              ×100=
              3
              8
              ×
              4
              5
              =
              18÷
              2
              9
              =
              4
              7
              ×
              7
              4
              =
              3
              5
              ÷3=
              45-45×
              1
              9
              =
              10-2.52=
              1
              3
              +
              7
              5
              ×
              5
              7
              =
              4
              13
              ×
              4
              5
              ÷
              4
              13
              ×
              4
              5
              =
            • 5. 直接写出得数
              354-167=50-24.8=3.14×5=1.21÷11=(8+
              1
              5
              )×
              5
              8
              =
              53=
              1
              5
              +
              1
              6
              =
              5.4×
              4
              9
              =
              24÷
              3
              5
              =
              6.125-(3.625+
              3
              8
              )=
            • 6. 直接写出得数.
              42=
              5
              2
              ×2=
              1
              6
              ×
              2
              5
              =
              3.14×3=0.52=
              77÷
              8
              9
              =
              3
              4
              ÷
              3
              8
              =
              1
              2
              ×
              2
              3
              =
              3.14×42=
              1
              5
              ×
              1
              5
              ÷
              1
              5
              ×=
              3.19×9=3.14×8=36×
              7
              9
              =
              102=0.012=
            • 7. 直接写出得数.
              6÷7=36÷1.8=5-0.3=
              3
              11
              ×9÷
              3
              11
              =
              3
              5
              ÷
              3
              5
              =
              0.12=3+
              3
              4
              =
              10×2÷10×2=
            • 8. 直接写出得数
              0.77+0.33=1.65+1.5=7÷1.4=0.23=
              2
              5
              +
              1
              3
              =
              2
              5
              ÷
              5
              18
              =
              10
              11
              ×
              22
              3
              =
              3
              5
              +
              2
              5
              =
            • 9. 神机妙算
              52-0.22=3.8+6.2=8.1÷3×2=
              5
              11
              ×33=
              568-198=
              3
              4
              -
              2
              3
              =
              3
              8
              =
              48×(
              1
              4
              -
              1
              6
              )=
              75×10%=
              2
              5
              +
              3
              5
              ×2=
            • 10. 口算下面各题.
              0.77+0.3=42×π=0.12=44.5-4=1.25×8=
              13-3
              2
              7
              =
              7
              15
              ÷2
              1
              3
              =
              1.2+120%=
              1
              4
              ×
              1
              5
              ÷
              1
              5
              ÷4=
              (92-72)×π=
            0/40

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