计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)

1个回答

  • (1)、

    48×1.08+1.2×56.8

    =12×4×1.08+1.2×5.68×10

    =12×4×1.08+12×5.68

    =12×﹙4×1.08+5.68﹚

    =12×﹙4.32+5.68﹚

    =12×10

    =120

    (2)、

    72×2.09﹣1.8×73.6

    =18×4×2.09﹣1.8×7.36×10

    =18×4×2.09﹣18×7.36

    =18×﹙4×2.09﹣7.36﹚

    =18×﹙8.36﹣7.36﹚

    =18×1

    =18