Question

【急求】八年级数学分式的计算，化简题。

化简，(a^-3b^4)^2乘(3a^2b)^-2.
(x+y)乘x^2/x^2-y^2+y^2/y-x.
y-3/4y-8除(y+2-5/y-2).
解分式方程，2/2-x+x^2-1/x^2-4+1/x+2＝1.
以上题目急需，有过程。

Answer 1

(a^-3b^4)^2乘(3a^2b)^-2=(a^-3b^4)^2/(3a^2b)^2=(b^3/3a^5)^2=b^6/9a^10

(x+y)乘x^2/x^2-y^2+y^2/y-x=(x+y)x^2/(x+y)(x-y)+y^2/y-x=x^2/(x-y)-y^2/(x-y)=x+y

y-3/4y-8除(y+2-5/y-2)=y-3/4y-8除(y^2-4-5/y-2)=y-3/4y-8除(y+3)(y-3)/(y-2)=y-3/4(y-2)乘(y-2)/(y+3)(y-3)=1/4(y+3)