5x-y=3"0.2x加0.3y=负0.9
1个回答
y=5x-3
代入
0.2x+0.3(5x-3)=-0.9
0.2x+1.5x-0.9=-0.9
1.7x=0
所以x=0
y=5x-3=-3
相关问题
5x加y等于3 0.2x加0.3y等于负0.9
5x-y=3,0.2x+0.3y=-0.9
解方程组:(1)0.3x-0.5y=-0.9且2.1x+y=7.2 (2)0.2x+0.5y=0且5(x+4-3(y+1
3x-5y+2=0 9x+6y-8=0
2x加3y减2等于0.4x减9y加1等于0
2x-3y-2=0 (2x-3y+5)/7+2y=9 x= y=
0.2x²y-0.5xy²-0.3x²y+0.7x²y
{9x-11y+1=0,4x-5y-3=0
用加减法解下列方程组:2x-2y-2=0,4x-3y-8=0 6x-3y=-5,4x-9y+1=0..
{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4