解方程组4x+3y=6 2x-y=44x+3y=6{ 2x-y=4
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解方程组4x+3y=6 2x-y=44x+3y=6{ 2x-y=4
解方程组4x+3y=6 2x-y=4
4x+3y=6
{
2x-y=4
解方程组4x+3y=6 2x-y=44x+3y=6{ 2x-y=4
4x+3y=6 ①
2x-y=4 ②
由②得 y=2x-4 ③
将③带入① 得4x+3(2x-4)=6
x=1.8
代入③ y=-0.4
所以 x=1.8 y=-0.4
4x+3y=6 (1)
2x-y=4 (2)
(1)-(2)*2
5y=-2
y=-2/5
代入(2)得
x=1.8
2x-y=4 整个方程乘上3
得6X-3Y=12
用4x+3y+6X-3Y=12+6
得4X+6X=18
X=1。8
把X=1。8代入2x-y=4
解得Y=-0。4
x=1.8 y=-o.4
问我算是问对人了,我就数学好,对付这种初中题还是很容易的。
X=1.8 Y=-0.4
绝对正确!
很简单啊,x=1.8,y=-0.4
X=2,Y=0
x=1.8 y=-o.4
y=-0.4 x=1.8
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