把y=6x^3-4x^2+9x-6 变成导数y'=18x^-8x+9 [9x-6]为什么会变成9?6又去哪了?

把y=6x^3-4x^2+9x-6 变成导数y'=18x^-8x+9 [9x-6]为什么会变成9?6又去哪了? 把2x-3y变成一次函数形式,急2x-3y等于6 把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²= 把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方= 椭圆C：X^2/9+Y^2/25=1.X'=5X,Y'=3Y.如何把他变成圆的方程 xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1 关于Y的整式方程是什么意思把X/Y+Y/3X=4/3变成关于Y的整式方程把X/Y+Y/3X=4/3变成关于Y的整式方程怎么变 把(x+y)看做是一个整体合并同类项：9(x+y)-2(x+y)-6(x+y)=多少? 1.分解因式：4x³-31x+152.把12x²+14xy-20y²+20x-11y+33.x³+6x²+11x+64.x⁴+2x³-9x²-2x+85.x²+xy-6y²+x+13y-66.x³+5x²+3x-9 二元一次方程第一步变数怎么变为什么这样变例：｛X-Y=3 ｛3X-8Y=14 把X-Y=3变成X=Y+3 那比如{3X+4y=16 {5X-6Y=33 {3X+4y=16怎么变 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 把6x（x－y）的平方＋3（y－x）的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]