八下 分式的基本性质通分(10a-b/-a²,a+b/3a:(2) 5/-4ab²,4/5a²b (3)x/a(x-y),y/b(y-x) (4)a/(y-x)²,b/(x-y)(x+y) 4.①3-2b,2a/b-a ②1/a+1,3/1-a,5/a²-1 ③a/a-b,b/a²-b²,c/a+b; ④a/a²-4,a-1/a-2,a+2/a&
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![八下 分式的基本性质通分(10a-b/-a²,a+b/3a:(2) 5/-4ab²,4/5a²b (3)x/a(x-y),y/b(y-x) (4)a/(y-x)²,b/(x-y)(x+y) 4.①3-2b,2a/b-a ②1/a+1,3/1-a,5/a²-1 ③a/a-b,b/a²-b²,c/a+b; ④a/a²-4,a-1/a-2,a+2/a&](/uploads/image/z/8695507-67-7.jpg?t=%E5%85%AB%E4%B8%8B+%E5%88%86%E5%BC%8F%E7%9A%84%E5%9F%BA%E6%9C%AC%E6%80%A7%E8%B4%A8%E9%80%9A%E5%88%86%EF%BC%8810a-b%2F-a%26%23178%3B%2Ca%2Bb%2F3a%EF%BC%9A%282%29+5%2F-4ab%26%23178%3B%2C4%2F5a%26%23178%3Bb+%283%29x%2Fa%28x-y%29%2Cy%2Fb%28y-x%29+%284%29a%2F%28y-x%29%26%23178%3B%2Cb%2F%28x-y%29%28x%2By%29+4.%E2%91%A03-2b%2C2a%2Fb-a+%E2%91%A11%2Fa%2B1%2C3%2F1-a%2C5%2Fa%26%23178%3B-1+%E2%91%A2a%2Fa-b%2Cb%2Fa%26%23178%3B-b%26%23178%3B%2Cc%2Fa%2Bb%EF%BC%9B+%E2%91%A3a%2Fa%26%23178%3B-4%2Ca-1%2Fa-2%2Ca%2B2%2Fa%26)
八下 分式的基本性质通分(10a-b/-a²,a+b/3a:(2) 5/-4ab²,4/5a²b (3)x/a(x-y),y/b(y-x) (4)a/(y-x)²,b/(x-y)(x+y) 4.①3-2b,2a/b-a ②1/a+1,3/1-a,5/a²-1 ③a/a-b,b/a²-b²,c/a+b; ④a/a²-4,a-1/a-2,a+2/a&
八下 分式的基本性质
通分
(10a-b/-a²,a+b/3a:(2) 5/-4ab²,4/5a²b (3)x/a(x-y),y/b(y-x) (4)a/(y-x)²,b/(x-y)(x+y) 4.①3-2b,2a/b-a ②1/a+1,3/1-a,5/a²-1 ③a/a-b,b/a²-b²,c/a+b; ④a/a²-4,a-1/a-2,a+2/a²-4a+4
八下 分式的基本性质通分(10a-b/-a²,a+b/3a:(2) 5/-4ab²,4/5a²b (3)x/a(x-y),y/b(y-x) (4)a/(y-x)²,b/(x-y)(x+y) 4.①3-2b,2a/b-a ②1/a+1,3/1-a,5/a²-1 ③a/a-b,b/a²-b²,c/a+b; ④a/a²-4,a-1/a-2,a+2/a&
(1)10a-b/-a²,a+b/3a:
10a-b/-a²=(b-10a)/a²=(3b-30a)/3a²
a+b/3a=(a²+ab)/3a²
(2) 5/-4ab²,4/5a²b
5/-4ab²=-25/20a²b²
4/5a²b=16/20a²b²
(3)x/a(x-y),y/b(y-x)
x/a(x-y)=bx/ab(x-y)
y/b(y-x)=-y/b(x-y)=-ay/ab(x-y)
(4)a/(y-x)²,b/(x-y)(x+y)
a/(y-x)²=a(x+y)/(x+y)(x-y)²
b/(x-y)(x+y)=b(x-y)/(x+y)(x-y)²
4.
①3-2b,2a/b-a
3-2b=(3-2b)(b-a)/(b-a)
2a/b-a=2a/(b-a)
②1/a+1,3/1-a,5/a²-1
1/a+1=(a-1)/(a²-1)
3/1-a=-3/(a-1)= -3(a+1)/(a²-1)
5/a²-1 =5/(a²-1)
③a/a-b,b/a²-b²,c/a+b
a/a-b=a(a+b)/(a²-b²)
b/a²-b²=b/(a²-b²)
c/a+b=c(a-b)/(a²-b²)
④a/a²-4,a-1/a-2,a+2/a²-4a+4
a/a²-4=a(a-2)/(a-2)²(a+2)
a-1/a-2=(a-1)(a-2)(a+2)/(a-2)²(a+2)
a+2/a²-4a+4=(a+2)²/(a-2)²(a+2)