{9x+2y=20,3x+4y=10怎么算

{9x+2y=20,3x+4y=10怎么算 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? [4x-2*(10-x)]-[5y-3*(10-y)]=20这个方程怎么解? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 用Excel找规律比如 2 3 42 3 y=6x+16 4 y=6x+20 5 y=6x+24 6 y=3x+7 y=6x+28 7 y=3x+8 y=6x+32 8 y=3x+9 y=6x+36 9 y=3x+10 y=6x+40 10 y=3X+11 y=6x+44 y=10x+110这样怎么让它出来下一个,这都是我自己写上去的.可以说详细点吗,我 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4y是怎么变成=2y(2x-y)÷4y 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian {2X=5(X+Y)3X-10(X+Y)=2怎么解? 9y=3x-(x-1),4(x+y)-(2x+4)=8y