Question

急!!!分式化简

分式化简

Answer 1

1、=x/x(x-3)-3/x(x-3)
通分
=x-3/x(x-3)
约去x-3
=1/x
2、=1
-
[a-b/a+2b]*[(a+2b)²/(a+b)(a-b)]
注:用[
]括起了一个单项式
=1
-
[(a+2b)/(a+b)]
=[(a+b)/(a+b)]
-
[(a+2b)/(a+b)]
=
-
[3b/a+b]
3、=3x(2y-3z)+2y(2z-3x)+Z(9x-4y)/6xyz
=(6xy-9zx+4yz-6xy+9xz-4yz)/6xyz
附:(6xy-9zx+4yz-6xy+9xz-4yz)=0
=0
4、=[2(x-3)/x-2]÷[(x+3)(3+x)/(3-x)]
=
-
[2/x+3]
5、=[(a+1)/(a-1)]*[(a-1)/a]
+
[1/(a-1)²]*[(a-1)/a]
=[(a+1)/a]+[1/a(a-1)]
=a²/a(a-1)
应该不用把分母化简吧，要化得话自己化一下叭~
6、={[4/a(a-2)]
-
[a²/a(a-2)]}*[a/(a+2)]
=
-
[(2+a)/a]*[a/(a+2)]
=
-1