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  • 1 # 使用者3296806220335

    五年級簡便小數乘除法計算題

    1.25×0.25×8×4

    解:原式=(1.25×8)×(0.25×4)

    =10×1

    =10

    0.125×0.25×0.5×64

    解:原式=0.125×0.25×0.5×8×4×2

    =(0.125×8)×(0.25×4)×(0.5×2)

    =1×1×1

    =1

    0.23×10.2

    解:原式=0.23×(10+0.2)

    =2.3+0.046

    =2.346

    7.5×99.8

    解:原式=7.5×(100-0.2)

    =750-1.5

    =748.5

    3.75×31+62.5×3.1

    解:原式=3.75×31+6.25×31

    =31×(3.75+6.25)

    =31×10

    =310

    7.68÷2.5÷4

    解:原式=7.68÷(2.5×4)

    =7.68÷10

    =0.768

    (9.1×4.8×7.5)÷(2.5×1.3×1.6)

    解:原式=9.1×4.8×7.5÷2.5÷1.3÷1.6

    =(9.1÷1.3)×(4.8÷1.6)×(7.5÷2.5)

    =7×3×3

    =63

    12.5×2.5×8×4

    64×12.5×0.25×0.05

    0.45×10.2

    0.25×99.8

    0.358×448+0.677×358-1.25×35.8

    1000;10;4.59;24.95;358

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