{4x+8(x+y)=480 {4y+9(x+y)=480不要复制黏贴的
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{4x+8(x+y)=480{4y+9(x+y)=480不要复制黏贴的{4x+8(x+y)=480{4y+9(x+y)=480不要复制黏贴的{4x+8(x+y)=480{4y+9(x+y)=480不要
{4x+8(x+y)=480 {4y+9(x+y)=480不要复制黏贴的
{4x+8(x+y)=480 {4y+9(x+y)=480
不要复制黏贴的
{4x+8(x+y)=480 {4y+9(x+y)=480不要复制黏贴的
4x+8(x+y)=4x+8x+8y=12x+8y=480, 即y=60-1.5x
4y+9(x+y)=4y+9x+9y=13y+9x=480
把y=60-1.5x代入上式得13(60-1.5x)+9x=480,解得x=200/7 y=120/7
楼上答案错误。
是7/200和7/120
详细过程```
4x+8(x+y)=480
4y+9(x+y)=480
2式相减
x-y-(x+y)=0
-2y=0
y=0
x=40
解方程组{4x+8(x+y)=480,4y+9(x+y)=480
9y=3x-(x-1),4(x+y)-(2x+4)=8y
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
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4x+8(x+y)=840 4y+9(x+y)=840
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4x+8(x+y)=480 4y+9(x+y)=480 = =
{4x+8(x+y)=480 {4y+9(x+y)=480不要复制黏贴的
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