作业帮2X+Y=3 3X-5Y=11
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/28 08:21:07
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2X+Y=3 3X-5Y=11
2X+Y=3 3X-5Y=11
2X+Y=3 3X-5Y=11
由第一个式子得到Y=3-2X,代入第二个式子
3X-5(3-2X)=11
13X=26
X=2
所以Y=-1
2X+Y=3的左右两边乘5，然后将此等式与第二个等式：3X-5Y=11相加；抵消了Y，只乘一个变量：Y；即可求得X=2；Y=-1；
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
3*X=Y X/2=Y/5+11
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13.
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快