作业帮(1)1-a/a*a-2a+1 (2)3x-4y/8xy-6x*x (3)2x*xy(x-y)/12xy*y(y-x)
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(1)1-a/a*a-2a+1 (2)3x-4y/8xy-6x*x (3)2x*xy(x-y)/12xy*y(y-x) (4)a*a-9/a*a-2a-3 (5)10a*a-43ab-9b*b/10
1题抄错了,是(a^2-2a+1)/(1-a)
1题抄错了,是(a^2-2a+1)/(1-a)
5灭错啊
1题抄错了,是(a^2-2a+1)/(1-a)
1题抄错了,是(a^2-2a+1)/(1-a)
5灭错啊
(1)
(1-a)/(a^2-2a+1)
=(1-a)/(1-a)^2
=1/(1-a)
(2)
(3x-4y)/(8xy-6x^2)
=(3x-4y)/[2x(4y-3x)]
=-1/(2x)
(3)
2x^2y(x-y)/[12x^2(y-x)]
=-y[2x^2(y-x)]/{6[2x^2(y-x)]
=-y/6
(4)
(a^2-9)/(a^2-2a-3)
=[(a+3)(a-3)][(a-3)(a+1)]
=(a+3)/(a+1)
(5)
题目有问题.
(10a^2-43ab-9b^2)/(10ab+2b^2)
=[(2a-9b)(5a+b)][2b(5a+b)]
=(2a-9b)/(2b)
(1-a)/(a^2-2a+1)
=(1-a)/(1-a)^2
=1/(1-a)
(2)
(3x-4y)/(8xy-6x^2)
=(3x-4y)/[2x(4y-3x)]
=-1/(2x)
(3)
2x^2y(x-y)/[12x^2(y-x)]
=-y[2x^2(y-x)]/{6[2x^2(y-x)]
=-y/6
(4)
(a^2-9)/(a^2-2a-3)
=[(a+3)(a-3)][(a-3)(a+1)]
=(a+3)/(a+1)
(5)
题目有问题.
(10a^2-43ab-9b^2)/(10ab+2b^2)
=[(2a-9b)(5a+b)][2b(5a+b)]
=(2a-9b)/(2b)
(1)1-a/a*a-2a+1 (2)3x-4y/8xy-6x*x (3)2x*xy(x-y)/12xy*y(y-x)
3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b
计算（1）x/x+y-x/x-y （2）a+2+4/a+2 （3）x^2-y^2/xy÷(x+y)
（1）.设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a（x
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
因式分解3a(x-y)+9(y-x) x的平方+y的平方-1-2xy (x+2)(x+6)+x的平方-4
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
x²+3y-xy-3x= x³-x²-x+= x²-1-2xy+y= a
已知A=5x^+2xy-4y^,B=-x^-4xy+y^,C=x^-xy+3y^其中xy满足|2x+1|+(y-4)^=