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(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)有一个打错了(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)
题目详情
(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)
有一个打错了
(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)
有一个打错了
(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)
▼优质解答
答案和解析
(3+5/7-2/3)×(1/5+1/7+1/13)-(1/5-1/7+1/13)×3+(1/5+1/7+1/13)×(2/3-7/5)
=(1/5+1/7+1/13)×(3+5/7-2/3+2/3-7/5)-(1/5-1/7+1/13)×3
=(1/5+1/7+1/13)×(3+5/7-7/5)-(1/5-1/7+1/13)×3-------------------------如果最后7/5是5/7的话
=(1/5+1/7+1/13)×3+(1/5+1/7+1/13)×(5/7-7/5)-(1/5-1/7+1/13)×3 则=2/7×3=6/7
=(1/5+1/7+1/13-1/5+1/7-1/13)×3+(1/5+1/7+1/13)×(5/7-7/5)
=2/7×3+(1/5+1/7+1/13)×(5/7-7/5)
=6/7+1/5×5/7+1/7×5/7+1/13×5/7-1/5×7/5-1/7×7/5+1/13×7/5
=11341/15925
=(1/5+1/7+1/13)×(3+5/7-2/3+2/3-7/5)-(1/5-1/7+1/13)×3
=(1/5+1/7+1/13)×(3+5/7-7/5)-(1/5-1/7+1/13)×3-------------------------如果最后7/5是5/7的话
=(1/5+1/7+1/13)×3+(1/5+1/7+1/13)×(5/7-7/5)-(1/5-1/7+1/13)×3 则=2/7×3=6/7
=(1/5+1/7+1/13-1/5+1/7-1/13)×3+(1/5+1/7+1/13)×(5/7-7/5)
=2/7×3+(1/5+1/7+1/13)×(5/7-7/5)
=6/7+1/5×5/7+1/7×5/7+1/13×5/7-1/5×7/5-1/7×7/5+1/13×7/5
=11341/15925
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