2.6*9.98简便计算还有0.032*2.5*1.25
问题描述：
2.6*9.98简便计算
还有0.032*2.5*1.25
答
2.6×9.98
=2.6×(10-0.02)
=26-0.052
=25.948
0.032×2.5×1.25
=0.001×4×2.5×8×1.25
=0.001*10*10
=0.1
答
=2.6*(10-0.02)
=26-0.0052
=25.9948
答
是这样计算的，跟下面楼主想的一样啊
2.6×9.98
=2.6×（10-0.02）
=2.6×10-2.6×0.02
=26-0.052
=25.948
0.032×2.5×1.25
=（0.4×2.5）×（0.08×1.25）
=1×0.1
=0.1
答
2.6*（10-0.02）
=26-0.052
=25.948
答
2.6×9.98
=2.6×（10-0.02）
=2.6×10-2.6×0.02
=26-0.052
=25.948
0.032×2.5×1.25
=（0.4×2.5）×（0.08×1.25）
=1×0.1
=0.1