第十三题谢谢！！！
1个回答
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原式
=[7+1/3-(4+1/12-3-3/20+2+17/30-2-7/42+2-7/56)]×1/32
=[7+1/3-(3+1/12-3/20+17/30-1/6-1/8)]×1/32
=[7+1/3-(3+10/120-18/120+68/120-20/120-15/120)]×1/32
=[7+1/3-(3+25/120)]×1/32
=[7+1/3-3-5/24]×1/32
=[4+8/24-5/24]×1/32
=[4+1/8]×1/32
=33/8×32
=33/256
=[7+1/3-(4+1/12-3-3/20+2+17/30-2-7/42+2-7/56)]×1/32
=[7+1/3-(3+1/12-3/20+17/30-1/6-1/8)]×1/32
=[7+1/3-(3+10/120-18/120+68/120-20/120-15/120)]×1/32
=[7+1/3-(3+25/120)]×1/32
=[7+1/3-3-5/24]×1/32
=[4+8/24-5/24]×1/32
=[4+1/8]×1/32
=33/8×32
=33/256
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