{8x+5y=8 {8x+8y=13.7怎么解
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{8x+5y=8 {8x+8y=13.7怎么解
{8x+5y=8 {8x+8y=13.7怎么解
{8x+5y=8 {8x+8y=13.7怎么解
8x+5y=8
8x+8y=13.7
下式减上式得
3y=5.7
y=1.9
代入8x+5y=8得
8x+5*1.9=8
8x=-1.5
x=-0.1875
{8x+5y=8 (1)
{8x+8y=13.7 (2)
(2)-(1)
3y=5.7
y=1.9
代入(1)
8x+5*1.9=8
x=-0.1875
两式相减得-3y=-5.7,得到y=1.9,代入一式可得x=-3/16.不懂可以在问我
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