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数学
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简便计算(x-3)/4+(x-4)/5+(x-5)/6+(x-6)/7=-4
人气:383 ℃ 时间:2020-05-08 12:37:46
解答
x-3=x+1-4
x-4=x+1-5
x-5=x+1-6
x-6=x+1-7
方程变为(x+1)(1/4+1/5+1/6+1/7)=0
x=-1
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