7/12-9/20+11/30-13/42+15/56怎么简算 1又1/2+3又1/6+5又1/1
7/12-9/20+11/30-13/42+15/56怎么简算1又1/2+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42怎么简算...
7/12-9/20+11/30-13/42+15/56怎么简算
1又1/2+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42怎么简算 展开
1又1/2+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42怎么简算 展开
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7/12-9/20+11/30-13/42+15/56
=(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1/3+1/8
=11/24
1又1/2+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42
=(1+3+5+7+9+11)+(1/2+1/6+1/12+1/20+1/30+1/42)
=36+(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=36+(1-1/7)
=36又6/7
=(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1/3+1/8
=11/24
1又1/2+3又1/6+5又1/12+7又1/20+9又1/30+11又1/42
=(1+3+5+7+9+11)+(1/2+1/6+1/12+1/20+1/30+1/42)
=36+(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=36+(1-1/7)
=36又6/7
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