化简 ①-1/2(x+y)+1/4(x-8)=?②(7m-8n)-2(m-4n+5)=?
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化简1/2x-1/x+y(x+y/2x-x-y)
1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简
化简:[(2x-y)平方+(2x+y)(2x-y)-4x(x-y+1)]÷2x
①3a(5a-2b) ②(x-3y) ×(-6x) ③化简x(x-1)+2x(x+1)-3x(2x-5) ①(x+2)(x+3)②(X-4)(x+1)
1.计算①(x-1-x+1分之8)×x+3分之x+1;②x+3y分之x-y÷x²+6xy+9y²分之x²-y²-x+y分之2y;③(x-x+1分之2x)÷x²-1分之x²-2x+1④(x²-2x分之x+2-x²-4x+4分之x-1)÷x³-2x²分之x-4
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
化简,求值2(x-2y)+(2y-x)-4(x-2y)-3(2y-x)其中x=-1,y=二分之一
化简:3x²-[5x-(1/2x-3)+2x²](1)3x²-[5x-(1/2x-3)+2x²](2)2(x+y)-1/4(x+y)+2/3(x-y)
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)(2)(3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x)
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
x²y-2x²-y+2 4x(x-y)²-12(x-y)³ 因式分解-x³+x²-4分之1x
计算 x-2分之x方+1-2-x分之3-4x (x+y)x方-y方分之x方+y-x分之y方
(x²-4y²)÷(2x+y)/xy×1/x(2y-x)(2x+y)/xy 1/x(2y-x) 都是一项
把下列各式因式分解 (1)、a^2(x-y)-4a(y-x)+4(x-y) (2)、(x+y)(x-y)-(x+z)(x-z)
-(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y)
1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/(x^2-5x+6)+(x^2-3x+8)/(x^2-4x+3)2.{(x^2)/(x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{(x^2/x^2+y^2)^2}