{6x+5y=8,3x=2y-5
1个回答
右式乘以2得,6x=4y-10,代入左式中,得4y-10+5y=8
9y=18
y=2
x=(2*2-5)/3=-1/3
相关问题
1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3
(1){5x-3y=5 6x+2y=6 (2){3x+2y=5x+2 2(3x+2y)=2x+8(3){x+3/3+y+
8y-(8-5y)=3y+2(4y+7) 8-3y=6-x 4x-3(20-x)=5x-7(20-
4(3x+8y)-5(2x-6y)
{y=3x-7{5x+2y=8{x-2y=3{2y+x=-1{2y-x=6{2x+y=8
(3){2x+5y=8,(4){2x+3y=6,
a) 5x-y=6 2x+y=1 b)3x-8y=2 2x+2y=-6
解方程(1) {5x+2y=2 7x-5y=34 (2){8x+3y+2=0,6x+5y+7=0 (3){x+1/3-y
3(x^4)^3-2(xy)^4x^8y+5(x^3y^2)x^6y
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