1x2÷1+2x3÷1+3x4÷1+4x5÷1+5x6÷1等于?
人气:336 ℃ 时间:2020-02-26 02:56:59
解答
错了
1÷(1x2)+1÷(2x3)+12/(3x4)+1÷(4x5)+1÷(5x6)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6
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