这个题利用乘法分配律计算简便
88×4/5+13×4/5-4/5等于
88×4/5+13×4/5-4/5
=（88+13-1）×4/5
=100×4/5
=80
88x4/5+13x4/5-4/5
=（88+13-1）×4/5
=100×4/5
=80
88x4/5+13x4/5-4/5
=（88+13-1）x4/5
=100x4/5
=80
88×4/5+13×4/5-4/5
=352/5+52/5-4/5
=404/5-4/5
=400/5
=80
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