0.54乘0.54+0.54乘0.46 15.7乘9.9+1.57 简便计算
问题描述:
0.54乘0.54+0.54乘0.46 15.7乘9.9+1.57 简便计算
答
gaofei494 ,
0.54×0.54+0.54×0.46
=0.54×(0.54+0.46)
=0.54×1
=0.54
15.7×9.9+1.57
=1.57×99+1.57
=1.57×(99+1)
=1.57×100
=157