{6x+5y=25① 3x+4y=20②
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
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
解二元一次方程.①y=2x-3 3x+2y=8 ②y=x+2 6x+5y=-1 ③3x+5y=11 x+4y=15
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
3x+4y=6①,x+2y=4② 2x+5y=16①,8x-7y=10②
已知/6x+5y-25/+(3x+4y-20)(3x+4y-20)=0,求x,y的值.
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1