(1)/4b·8b/9a^2 (2) xy^3/8c^2d÷xy/2cd^2 (3) a-b/b·ab/2a-2b (4)2x-3y·6x-9y/2x^2y^2 (5)1/(y-x)^2·x-y/x+y(6)/x^2+x÷(x^2-6x+9)1和4、6打错了,应该是3a/4b·8b/9a^2 和xy/2x-3y·6x-9y/2x^2y^2和x-3/x^2+x÷(x^2-6x+9)这几题我总算

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(1)/4b·8b/9a^2(2)xy^3/8c^2d÷xy/2cd^2(3)a-b/b·ab/2a-2b(4)2x-3y·6x-9y/2x^2y^2(5)1/(y-x)^2·x-y/x+y(6)/x

(1)/4b·8b/9a^2 (2) xy^3/8c^2d÷xy/2cd^2 (3) a-b/b·ab/2a-2b (4)2x-3y·6x-9y/2x^2y^2 (5)1/(y-x)^2·x-y/x+y(6)/x^2+x÷(x^2-6x+9)1和4、6打错了,应该是3a/4b·8b/9a^2 和xy/2x-3y·6x-9y/2x^2y^2和x-3/x^2+x÷(x^2-6x+9)这几题我总算
(1)/4b·8b/9a^2 (2) xy^3/8c^2d÷xy/2cd^2 (3) a-b/b·ab/2a-2b
(4)2x-3y·6x-9y/2x^2y^2 (5)1/(y-x)^2·x-y/x+y
(6)/x^2+x÷(x^2-6x+9)
1和4、6打错了,应该是3a/4b·8b/9a^2 和xy/2x-3y·6x-9y/2x^2y^2和x-3/x^2+x÷(x^2-6x+9)
这几题我总算错,所以,这是分式的题(急用!21:00之前希望有答案TAT)

(1)/4b·8b/9a^2 (2) xy^3/8c^2d÷xy/2cd^2 (3) a-b/b·ab/2a-2b (4)2x-3y·6x-9y/2x^2y^2 (5)1/(y-x)^2·x-y/x+y(6)/x^2+x÷(x^2-6x+9)1和4、6打错了,应该是3a/4b·8b/9a^2 和xy/2x-3y·6x-9y/2x^2y^2和x-3/x^2+x÷(x^2-6x+9)这几题我总算
(1) 3a/4b × 8b/9a^2
= 3a×8b/4b×9a²
=2/3a
(2) xy^3/8c^2d÷xy/2cd^2
=xy^3/8c^2d × 2cd^2/xy
=dy²/4c
(3)a-b/b × ab/2a-2b
=a-b/b × ab/2(a-b )
=a/2
(4)xy/2x-3y·6x-9y/2x^2y^2
=xy/2x-3y × 3(2x-3y)/2x^2y^2
= 3/2xy
(5)1/(y-x)^2·x-y/x+y
=1/(x-y)² × x-y/x+y
=1/x²-y²
(6)x-3/x^2+x÷(x^2-6x+9)
=x-3/x(x+1) × 1/ (x-3)²
=1/x(x+1)(x-3)

要干嘛? 化简吗

什么意思? 是化简?

1.(a-b)(a^2+ab+b^3)2.(a-b)(a^3+a^2b+ab^2+b^3)3.(a-b)(a^4+a^3b+a^2b^2+ab^3+b^4)4.(a-b)(a^10+a^9b+a^8b^2+...+ab^9+b^10)5.(X-1)(x^5+x^4+x^3+x^2+1)6.(a-b)(a^n+a^n-1b+a^n-2b^2+...+ab^n-1+b^n) x/a^2-bx+x/b=1 (a,b不等于0)x-8/x-3-x-9/x-4=1/x+3-1/x+8 (a+b)²-c² x² -6x+94a² +4ab+b² -9x² +12xy-4y² a² +ab+1/4b² (2a+b)² -8(2a+b)+16(x+z)² -(x-z)² -3x+6x² -3x³(a-b)² -1005a² -20b² a² (x-y)+b² (y-x)8a³- (3x^y-2x+1)(-2xy)(2x-1)(x-3)-3a(a-b)^2(x-2)(x-3)-(x+5)(x-5)(a+2b-3c)(a-2b-3c)(2a+b)^2(2a-b)^2因式分解4a^2-16-2x^2-12xy^2+8xy^3a^2-4(a-b)^24x(a-b)-8y(b-a)(a+3b)^2-9(a-b)^2(x^2-5)^2+8(x^2-5)+16(a^2+b^2)^2-4a^2b^225(a+b)^2-9(a-b)^2 (3x+2)(x-1)分之4x-9=3x+2分之A-x-1分之B(A,B为常数)求A,B (3x+2)(x-1)分之4x-9=3x+2分之A-x-1分之B(A,B为常数)求A,B 若分式4X-9/3x平方-x-2=A/3x+2-B/X-1(A B为常数),则A B的值? 计算:(1)(x平方/x-2+4/2-x)除以x+2/x (2)a+b-a平方/a-b-b平方/b-a+1 a=x³-2x²+x-7,b=6x²-8x+4,c=x³-2x²-9,求(1)a-2b+c;(2)4a-2b+3c 分解因式-1+4(a-b)^2(4x-3y)^2-16y^2-a^2+9(b-c)^2(x^2-4x)^2+8(x^2-4x)+164(a+b)^2-12(a+b)+9 a(x^2-y^2)+b(y^2-x^2)(a^2-a)^2-(a-1)^2 (1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8(2) 已知x+3/(x-2)^2=A/x-2 + B/(x-2)^2 ,求A和B的值. 关于X的方程a(a-4)x-b(b-6)=9-4x有无数解,求{a-4ab/(a+b)}/{a/(a+b)-b/(b-a)-2ab/(a平方-b平方)}的值. 若分式4x-9/3x^2=A/3x+2-B/x-1(A,B为常数),A,B的值为 1 9-6(a+b)+(a+b)^22 4a^2b-4ab^2+b^3计算题 (a-b+3)(a+b-3)化简 x(2x+1)(1-2x)-4x(x-1)(1-x) (1)1/2x+3,3/3-2x.2x+5/4x^2-9(2)a/a-b,b/a^2-b^2,c/a+b ⒈已知集合A={0,2,3},B={x|x=a·b,a,b∈A},则B的子集个数().A.4个 B.8个 C.15个 D.16个⒉设a,b∈R,集合{1,a+b,a}={0,b/a,b},则b-a=().A.1 B.-1 C.2 D.-2 1/4(a-b)^2x(b-a)^3x(-a-b)^5x(2a+2b)^4 1.x+9/x+8- x+10/x+9=x+6/x+5- x+7/x+6;2.x³+2/x²-x+1+ x³-9/x²+2x+4=2x-1;3.x-a-b/c+ x-b-c/a+ x-c-a/b=3.(空开的指另一个分式)第二题不用了。