(1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2(2)3a/a+b - 3b/a+b(3)x+3/x^2-9 + 3/x-3(4)x^2/x+y - x+y(5)(a^2/a-3 + 9/3-a)÷a+3/a
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/08 09:08:03
(1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2
(2)3a/a+b - 3b/a+b
(3)x+3/x^2-9 + 3/x-3
(4)x^2/x+y - x+y
(5)(a^2/a-3 + 9/3-a)÷a+3/a
(1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2=(x-y)/(x-2y)÷(x+y)(x-y)/(x-2y)²
=(x-y)/(x-2y)*(x-2y)²/(x+y)(x-y)
=(x-2y)/(x+y)
(2)3a/a+b - 3b/a+b=3a/(a+b)+3b/(a+b)
=3(a+b)/(a+b)
=3
(3)x+3/x^2-9 + 3/x-3=(x+3)/[(x+3)(x-3)]+3/(x-3)
=1/(x-3)+3/(x-3)
=4/(x-3)
(4)x^2/x+y - x+y=x²/(x+y)-(x-y)
=(x²-x²+y²)/(x+y)
=y²/(x+y)
(5)(a^2/a-3 + 9/3-a)÷a+3/a
=[a²/(a-3)+9/(3-a)]÷(a+3)/a
=[a²/(a-3)-9/(a-3)]*a/(a+3)
=[(a²-9)/(a-3)]*a/(a+3)
=[(a+3)(a-3)/(a-3)]*a/(a+3)
=(a+3)*a/(a+3)
=a
更丰富的广东司法是
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
1/2x-(x+y/2x -x-y)÷(x+y)
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
化简y(x+y)+(x+y)(x-y)-x^2
[(-2x-y)^2-(2x+y)(2x-y)]÷2y-1/2y
[(x+2y)²-(x+y)(x-y)-7y²】÷(2y)
(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
先化简,再求值 (1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009 (2)y(x+y)+(x+y)(x-y)-x的平方,先化简,再求值(1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009(2)y(x+y)+(x+y)(x-y)-x的平方,其中x=-2,y=二分
(x-y/1-x+y/1)÷2y/y-x计算错了,是(1/x-y-1/x+y)÷2y/y-x
(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2
【(2x-y)(2x+y)+y(y-6x)】÷2x
计算:[(x+y)³-2(x+y)²-4(x+y)]÷(x+y)
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)