七下数学分式的加减的几道题1.2/(a-1)+(a-1)/(1-a) 2.(n^2+m^2)/(mn)+(m-n)^2/(-mn) 3.先化简,再求值:(a-2b)/(a^2-b^2)-a/(b^2-a^2),其中a=-2,b=3.4.(a-2b)/(a-b)-3b/(a-b)-4b/(b-a) 5.(m^2-3)/(m-2)+1/(m-2)-(6-4m)/(2-m)6.当x=-2/3时,求6/(x^
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![七下数学分式的加减的几道题1.2/(a-1)+(a-1)/(1-a) 2.(n^2+m^2)/(mn)+(m-n)^2/(-mn) 3.先化简,再求值:(a-2b)/(a^2-b^2)-a/(b^2-a^2),其中a=-2,b=3.4.(a-2b)/(a-b)-3b/(a-b)-4b/(b-a) 5.(m^2-3)/(m-2)+1/(m-2)-(6-4m)/(2-m)6.当x=-2/3时,求6/(x^](/uploads/image/z/4027549-13-9.jpg?t=%E4%B8%83%E4%B8%8B%E6%95%B0%E5%AD%A6%E5%88%86%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%E7%9A%84%E5%87%A0%E9%81%93%E9%A2%981.2%2F%28a-1%29%2B%28a-1%29%2F%281-a%29+2.%28n%5E2%2Bm%5E2%29%2F%28mn%29%2B%28m-n%29%5E2%2F%28-mn%29+3.%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%3A%28a-2b%29%2F%28a%5E2-b%5E2%29-a%2F%28b%5E2-a%5E2%29%2C%E5%85%B6%E4%B8%ADa%3D-2%2Cb%3D3.4.%28a-2b%29%2F%28a-b%29-3b%2F%28a-b%29-4b%2F%28b-a%29+5.%28m%5E2-3%29%2F%28m-2%29%2B1%2F%28m-2%29-%286-4m%29%2F%282-m%296.%E5%BD%93x%3D-2%2F3%E6%97%B6%2C%E6%B1%826%2F%28x%5E)
七下数学分式的加减的几道题1.2/(a-1)+(a-1)/(1-a) 2.(n^2+m^2)/(mn)+(m-n)^2/(-mn) 3.先化简,再求值:(a-2b)/(a^2-b^2)-a/(b^2-a^2),其中a=-2,b=3.4.(a-2b)/(a-b)-3b/(a-b)-4b/(b-a) 5.(m^2-3)/(m-2)+1/(m-2)-(6-4m)/(2-m)6.当x=-2/3时,求6/(x^
七下数学分式的加减的几道题
1.2/(a-1)+(a-1)/(1-a) 2.(n^2+m^2)/(mn)+(m-n)^2/(-mn) 3.先化简,再求值:(a-2b)/(a^2-b^2)-a/(b^2-a^2),其中a=-2,b=3.
4.(a-2b)/(a-b)-3b/(a-b)-4b/(b-a) 5.(m^2-3)/(m-2)+1/(m-2)-(6-4m)/(2-m)
6.当x=-2/3时,求6/(x^2-3x)-(x-9)/(3x-x^2)的值.
七下数学分式的加减的几道题1.2/(a-1)+(a-1)/(1-a) 2.(n^2+m^2)/(mn)+(m-n)^2/(-mn) 3.先化简,再求值:(a-2b)/(a^2-b^2)-a/(b^2-a^2),其中a=-2,b=3.4.(a-2b)/(a-b)-3b/(a-b)-4b/(b-a) 5.(m^2-3)/(m-2)+1/(m-2)-(6-4m)/(2-m)6.当x=-2/3时,求6/(x^
1.将分母(1-a)化成-(a-1),可以得到2/(a-1)-(a-1)/(a-1)=2/(a-1)-1,
最后的答案是(3-a)/(a-1) 下面基本上都是将分母提个负号出来.
2.答案=2
3.化简后是2/(a+b),代入数据可以得答案,2.
4.答案=1
5.m-2
6.先化简得1/x,代入数据,可以得答案-3/2.
如果不懂的话,欢迎随时咨询!
1.原式=(2/a-1)-(a-1/a-1)=2-a+1/a-1=3-a/a-1
2.原式=(2n+2m/mn)-(2m-2n/mn)=(2n+2m-2m+2n)/mn=4n/mn=4/m
1、3-a/a-1
2、2
3、2/(a+b) 2
4、1
5、m-2
6、1/x -3/2