48.28+(1.7-0.17)-19.86
问题描述:
48.28+(1.7-0.17)-19.86
能不能巧算
能的话给算式
答
48.28+(1.7-0.17)-19.86
=(50-1.72)+(2-0.47)-(20-0.14)
=32-(1.72+0.47-0.14)
=32-2.05
=30-0.05
=29.95答案不对,正常算的是29.95