x/2+y/3=3 7x-8y+4=0
1个回答
3X+2Y=18 12X+8Y=72
7X-8Y=0
19X=72
X=72/19
Y=7*72/19/8=63/19
相关问题
(1)y=x,y+4x=15; (2)x+2x-3y=1; (3)x-7y=0,x-9y=8=0.
{2x-7y=8 3x-8y-7=0
8y-(8-5y)=3y+2(4y+7) 8-3y=6-x 4x-3(20-x)=5x-7(20-
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x\2+y\3=-3,7x=8y-4
解方程{y=3x=2,3x+y=8 {3x+2y=8,7x+4y=15
1.3x+3y-z=16 2.3(x+y)-4(x-y)=4 3.0.4x+0.3y=0.7
{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4
|x-8|+|2y-7|=0,求3x+4y的值
2x+3y/4+2x-3y/3=7和2x+3y/3+2x-3y/2=8 x=?,y=?