(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3/1+4/1)如何简算(或计算)求帮忙
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![(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3/1+4/1)如何简算(或计算)求帮忙](/uploads/image/z/13063222-46-2.jpg?t=%EF%BC%881%2B2%2F1%2B3%2F1%2B4%2F1%29%C3%97%EF%BC%882%2F1%2B3%2F1%2B4%2F1%2B5%2F1%29%EF%BC%8D%EF%BC%881%2B2%2F1%2B3%2F1%2B4%2F1%2B5%2F1%29%C3%97%EF%BC%882%2F1%2B3%2F1%2B4%2F1%29%E5%A6%82%E4%BD%95%E7%AE%80%E7%AE%97%EF%BC%88%E6%88%96%E8%AE%A1%E7%AE%97%EF%BC%89%E6%B1%82%E5%B8%AE%E5%BF%99)
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(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3/1+4/1)如何简算(或计算)求帮忙
(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3/1+4/1)如何简算(或计算)求帮忙
(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3/1+4/1)如何简算(或计算)求帮忙
先变成(1+2+3+4)X(2+3+4+5)-(1+2+3+4+5)X(2+3+4)
=>(10X14)-(15X9)=140-135=5