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简算7×8/15-7×12/35+7×16/63-20/99×726×28×(1简算7×8/15-7×12/35+7×16/63-20/99×726×28×(1/26×1/27+1/27+1/28)==
题目详情
简算7×8/15-7×12/35+7×16/63-20/99×7 26×28×(1
简算7×8/15-7×12/35+7×16/63-20/99×7 26×28×(1/26×1/27+1/27+1/28)
= =
简算7×8/15-7×12/35+7×16/63-20/99×7 26×28×(1/26×1/27+1/27+1/28)
= =
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答案和解析
7×8/15-7×12/35+7×16/63-20/99×7 =7×(1/3+1/5)-7×(1/5+1/7)+7×(1/7+1/9)-7×(1/9+1/11)=7×(1/3-1/11)=7×8/33=56/3326×28×(1/26×1/27+1/27+1/28)=26×28×(27/26×1/27+1/28) =26×28×(1/26+1/28) =26×...
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