2x+9y=81 9x+4y=35

4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 、1.2x+9y=81 3x+y=341.2x+9y=81 3x+y=34 2.9x+4y=35 8x+3y=30 3.7x+2y=52 7x+4y=62 4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2y=21 3x+5y=56 7.5x+7y=52 5x+2y=22 8.5x+5y=65 7x+7y=203 9.8x+4y=56 x+4y=21 10.5x+7y=41 5x+8y=44 11.7x+5y=54 3x+4y=38 12.x+8y=15 9y=3x-(x-1),4(x+y)-(2x+4)=8y 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 二元一次方程组计算题的步骤答案2x+9y=81 3x+y=34 9x+4y=35 8x+3y=30 7x+2y=52 7x+4y=62 4x+6y=54 9x+2y=87 2x+y=7 2x+5y=19 x+2y=21 3x+5y=56 5x+7y=52 5x+2y=22 5x+5y=65 7x+7y=203 8x+4y=56 x+4y=21 5x+7y=41 5x+8y=44 7x+5y=54 3x+4y=38 x+8y=15 4x+ 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 二元一次方程组试题1.2x+9y=81 3x+y=34 2.9x+4y=35 8x+3y=30 3.7x+2y=52 7x+4y=62 4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2y=21 3x+5y=56 7.5x+7y=52 5x+2y=22 8.5x+5y=65 7x+7y=203 9.8x+4y=56 x+4y=21 10.5x+7y=41 5x+8y=44 11.7x+5y=54 3x+4y=38 12.x+ 9(x-y)^2-12(x-y)+4=快 因式分解：4+12(x+y)+9(x-y)^2=? (2X-3Y)(?)=-4X^+9Y^```` 如果x+y/2=x-y/3=3x-2y+9/4,那么x= ,y=如果x+y/2=x-y/3=3x-2y+9/4,那么x= ,y= (x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2 先化简再求值 x(9x-y)-y(y-x)+(x-y)的平方,其中x=-1,y=2 解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1 接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11