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4除以3-7除以12+9除以20-11除以30+13除以42-15除以56+17除以72-19除以90
人气:156 ℃ 时间:2019-08-18 15:14:01
解答
4/3-7/12+9/20-11/30+13/42-15/56+17/72-19/90
=(4/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)-(1/9+1/10)
=4/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8+1/8+1/9-1/9-1/10
=4/3-1/3-1/10
=9/10
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