1.(x+y)-4(x+y-1) 2.(x2+y2)-4x2y2 (字母后的2是平方) 分解因式

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1.(x+y)-4(x+y-1) 2.(x2+y2)-4x2y2 (字母后的2是平方) 分解因式
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1.(x+y)-4(x+y-1) 2.(x2+y2)-4x2y2 (字母后的2是平方) 分解因式
1.(x+y)-4(x+y-1) 2.(x2+y2)-4x2y2 (字母后的2是平方) 分解因式

1.(x+y)-4(x+y-1) 2.(x2+y2)-4x2y2 (字母后的2是平方) 分解因式
(x+y)2-4(x+y-1)
=(x+y)平方-4(x+y)+4
=(x+y-2)平方



2.(x2+y2)2-4x2y2

=(x2+y2)2-(2xy)平方
=(x2+y2-2xy)(x2+y2+2xy)
=(x-y)平方(x+y)平方

1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2)/2(x-y)^2 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} 1.(x/y-y/x)/(x+y) 2.(x的平方-4分之2x-x-2分之1)乘x-1分之x+2 计算:1.(x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y)1.(x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y) 1.已知二元一次方程3X+4Y=6,当X,Y互为相反数,X=?Y=?当X与Y相等,X=?Y=?2.{Y=3/2X 3{3X-Y=5 4.{5X+Y=32X+8Y=22 5X+3Y-13=0 2X+3Y=-10.55.{X+1=5(Y+2)3(2X-5)-4(3Y+4)=53-5题用代入法解方程组2.{Y=3/2X 2X+8Y=223{3X-Y=55X+3Y-13=0 初一计算题(请写清楚步骤)1.(x+5)(x+5)-(x-2)(x-3)2.(2x-y)(2x-y)-4(x-y)(x+2y)3.(x+y+z)(x-y+z) 【因式分解】计算 化简或求值 1.(x^2-y^2)(x^2+xy+y^2) / (x+y)(x^3-y^3)2.(x^2-4x+4)(3-x) / (2x-6)(x^2+x-6)3.已知 x+y=1,xy= -2,求(x^2+y^2+xy) / (x^2+y^2-xy) 的值4.已知(x^2+y^2)(x^2+y^2-1)=12,求x^2+y^2的值 1.y=(3+x)/(4-x) 2.y=5/2x^2-4x+3 3.y=x+√(1-2x) 沪教版七年级第一学期数学练习部分9.14 急1.将多项式-x²+y²分解因式得( )(A)(x+y)(x-y) (B)(-x+y)(-x-y) (C)(-x+y)(x+y) (D)(-x+y)(x-y)2.将下列各式表示成平方差的形式(1)100=________ (2)a^4=______ (3 (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 原题为1.计算1)(-2y^3)^2+(-4y^2)^3-[(-2y)^2·(-3y^2)^2]2) (3x+2)^2-(3x-2)^2+(3x+2)^2·(3x-2)^22.化简求值(x^2+3x)(x-3)-x(x-2)^2+(-x-y)(y-x),其中 x=3,y=2. 解方程组:2X+Y=8 3X-Y=7 X=?Y=?快,1.{2X+Y=8 2.{5X-8Y=8 3.{4X+3Y=1 4.{2X=5(X+Y){3X-Y=7 {3X+4Y=7 {2X+Y=2 {3X-10(X+Y)=2X=?Y=?X=?Y=?X=?Y=?X=?Y=? 1.(m-1)^5÷(m-1)^3 2.(x-y)^10÷(x-y)^5÷(y-x)^4 3.(2x-y)^12÷【(2x-y)^3·(2x-1.(m-1)^5÷(m-1)^3 2.(x-y)^10÷(x-y)^5÷(y-x)^4 3.(2x-y)^12÷【(2x-y)^3·(2x-y )^4】 1.(m-1)^5÷(m-1)^3 2.(x-y)^10÷(x-y)^5÷(y-x)^4 3.(2x-y)^12÷【(2x-y)^3·(2x-y1.(m-1)^5÷(m-1)^3 2.(x-y)^10÷(x-y)^5÷(y-x)^4 3.(2x-y)^12÷【(2x-y)^3·(2x-y )^4】 填空1.(3x-1)(4x+5)2.(-4x-y)(-5x+2y)3.(x+3)(x+4)-(X-1)(X-2)4.(y-1)(y-2) (x +y)的平方-4(x+ (x +y)的平方-4(x+ y-1)~(因式分解) (2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1) 若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()