把4x-3y-9=0,x-2y-1=0.这两个化简

把4x-3y-9=0,x-2y-1=0.这两个化简 常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x) 9y=3x-(x-1),4(x+y)-(2x+4)=8y 分解因式:(x+1)(x+2)(x+3)(x+4)+1已知x*x+2x+y*y-6y+10=0 求X的Y次方已知X和Y为相反数.且XY=-1/4 求代数式x*x*x*y+2x*x*y*y+x*y*y*y的值把第一题写清楚一点哦,另外请教下,幂怎么在电脑上打出来? 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= 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 1、把二元一次方程6x-5y的x用含y的代数式表示出来的是__________2、已知|x-8y|+2（4y-1）²+3|8z-3x|=0,则x+y+z=________3、方程组｛4x-y=k 2x+3y=1｝中x、y的值相等,则k=____________4、方程组｛x+y=5k x-y=9k｝的 x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? 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= (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 求由方程y^5+3x^2y+5x^4+x=1所确定的隐函数y=y(x)在x=0处的导数5(y^4)*y'+3*2xy+3x^2*y'+5*4x^3+1=0(求导时把y看成x的函数）5y^4为什么要乘y',为什么把y看成x的函数就要乘y' 解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1