Question

72.88×7.2+72.8×1.8+7.28简便运算？

Answer 1

72.88×7.2+72.8×1.8+7.28简便运算？
72.88×7.2+72.8×1.8+7.28
=524.736+131.04+7.28
=663.056

Answer 2

简便运算是
72.88x7.2+72.8x1.8+7.28
=72.88x7.2+72.8x(18+1)
=72.88x7.2+72.8x19
=1907.936

Answer 3

运用乘法分配律:
72.8×7.2+72.8×1.8+72.8
=72.8×(7.2+1.8+1)
=72.8×10
=728
(原题中数字有问题,不具备乘法分配律运用的特征)

Answer 4

72.88×7.2+72.8×1.8+7.28
=72.88×7.2+72.8×1.8+72.8×0.1
=72.88×7.2+72.8×（1.8+0.1）
=72.88×7.2+72.8×1.9
=（72.8+0.08）×7.2+72.8×1.9
=72.8×7.2+0.08×7.2+72.8×1.9
=72.8×7.2+72.8×1.9+0.08×7.2
=72.8×（7.2+1.9）+0.08×7.2
=72.8×9.1+0.08×7.2
=72.8×（9+0.1）+0.08×7.2
=655.2+7.28+0.576
=663.056