86.9*1.73-8.69*7.3简便方法怎么做
问题描述:
86.9*1.73-8.69*7.3简便方法怎么做
答
随波……,你好:
86.9×1.73-8.69×7.3
=86.9×1.73-86.9×0.73
=86.9×(1.73-0.73)
=86.9×1
=86.9