若{x=1 y=-1 { x=2 y=2和{x=3 y=c都是方程ax+by+2的解,求c的值.)
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若{x=1y=-1{x=2y=2和{x=3y=c都是方程ax+by+2的解,求c的值.)若{x=1y=-1{x=2y=2和{x=3y=c都是方程ax+by+2的解,求c的值.)若{x=1y=-1{x=
若{x=1 y=-1 { x=2 y=2和{x=3 y=c都是方程ax+by+2的解,求c的值.)
若{x=1 y=-1 { x=2 y=2和{x=3 y=c都是方程ax+by+2的解,求c的值.)
若{x=1 y=-1 { x=2 y=2和{x=3 y=c都是方程ax+by+2的解,求c的值.)
{x=1 y=-1 { x=2 y=2和{x=3 y=c都是方程ax+by+2的解,所以有
a-b+2=0
2a+2b+2=0
3a+bc+2=0
得解为
a=-1.5
b=0.5
c=5
c的值是5.
{x=1 y=-1 { x=2 y=2和{x=3 y=c都是方程ax+by+2的解,所以有
a-b+2=0
2a+2b+2=0
3a+bc+2=0
得解为
a=-1.5
b=0.5
c=5
c的值是5.
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