{3(x-10)=4(y-4),0.5x+0.3y=0.25;解这个方程组
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{3(x-10)=4(y-4),0.5x+0.3y=0.25;解这个方程组{3(x-10)=4(y-4),0.5x+0.3y=0.25;解这个方程组{3(x-10)=4(y-4),0.5x+0.3y=
{3(x-10)=4(y-4),0.5x+0.3y=0.25;解这个方程组
{3(x-10)=4(y-4),0.5x+0.3y=0.25;解这个方程组
{3(x-10)=4(y-4),0.5x+0.3y=0.25;解这个方程组
3x-4y=14
5x+3y=2.5
9x-12y=42
20x+12y=10
29x=52
x=52/19
y=159/76
化解0.5x+0.3y=0.25 得X=0.5+0.6y 代入原式解下就好了。
很简单嘛 你是初中生吧 可以追问
由(1)得 3X-4Y=14 (3)
由(2)得 10X+6Y=5 (4)
(3)X3+(4)X2得
9X-12Y+20X+12Y=42+10
29X=52
X=52/29
Y=125/58
0.5X+0.3Y=0.25 两边同时乘以2得:X+0.6Y=0.5 即有:X=0.所以X=0.5-0.6Y,代入第一个式子得3(0.5-0.6Y-1)=4(Y-4) 解得,
x=37/49
y= -125/49
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