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数学
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【数学分式计算,要过程】【(a²-1)分之4】-【(a²+a)分之2】
【分式加减,要过程】
【(a²-1)分之4】-【(a²+a)分之2】
【(5a-20)分之1】+【(a²-8a+16)分之5】
【(x-1)分之x²】-x-1
人气:362 ℃ 时间:2019-08-22 14:25:45
解答
1、4/(a+1)(a-1)-2/a(a+1)
=4a/a(a+1)(a-1)-2(a-1)/a(a+1)(a-1)
=(4a-2a+2)/a(a+1)(a-1)
=2(a+1)/a(a+1)(a-1)
=2/(a²+a)
2、=1/5(a-4)+5/(a-4)²
=(a-4)/5(a-4)²+25/5(a-4)²
=(a+21)/5(a-4)²
3、=x²/(x-1)-(x+1)(x-1)/(x-1)
=(x²-x²+1)/(x-1)
=1/(x-1)
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