Question

你会用简便方法计算下面各题吗?71.2-(32.46-18.8) 65.4

(32.5+15.4)

Answer 1

71.2-(32.46-18.8)
=(71.2+18.8)-32.46
=90-32.46
=57.54
65.4-(32.5+15.4)
=(65.4-15.4)-32.5
=50-32.5
=17.5

Answer 2

71.2-(32.46-18.8)
=(71.2+18.8)-32.46
=90-32.46
=57.54
65.4-(32.5+15.4)
=(65.4-15.4)-32.5
=50-32.5
=17.5

Answer 3

71.2+18.8-32.46 & 65.4-15.4+32.5就这么简单

追答

第二题有个+号你忘写了吧