0.65加0.35乘1.8 简便计算
问题描述:
0.65加0.35乘1.8 简便计算
答
0.65+0.35×1.8
=0.65+0.35×(1+0.8)
=0.65+0.35×1+0.35×0.8
=0.65+0.35+0.28
=1+0.28
=1.28