2x+3y=2,4x-9y=-1,
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/25 16:41:14
2x+3y=2,4x-9y=-1,2x+3y=2,4x-9y=-1,2x+3y=2,4x-9y=-1,1式乘以2减去2式,得y等于1/3然后算的x等于1/2
2x+3y=2,4x-9y=-1,
2x+3y=2,4x-9y=-1,
2x+3y=2,4x-9y=-1,
1式乘以2减去2式,得y等于1/3 然后算的x等于1/2
9y=3x-(x-1),4(x+y)-(2x+4)=8y
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
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(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
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值
解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1
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)
[(y-2x)(-2x-y)+4(x-2y)平方]/3y,其中x=1,y=-3
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值