{2x+3y=3 4x-y=13{:这是大括号两个式子一大括号相连的
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{2x+3y=34x-y=13{:这是大括号两个式子一大括号相连的{2x+3y=34x-y=13{:这是大括号两个式子一大括号相连的{2x+3y=34x-y=13{:这是大括号两个式子一大括号相连的2
{2x+3y=3 4x-y=13{:这是大括号两个式子一大括号相连的
{2x+3y=3 4x-y=13
{:这是大括号
两个式子一大括号相连的
{2x+3y=3 4x-y=13{:这是大括号两个式子一大括号相连的
2x+3y=3 (1)
4x-y=13 (2)
由(2)得到y=4x-13
代入(1)
2x+3(4x-13)=3
2x+12x-39=3
14x=42
x=3
y=4x-13=-1
2x+3y=3 (1) 4x-y=13 (2) 由(2)得到y=4x-13 代入(1) 2x+3(4x-13)=3 2x+12x-39=3 14x=42 x=3 y=4x-13=-1
2x+3y=3(1),
4x-y=13(2),
(1)+(2)*3
14x=42,
x=3,y=-1
Y=4X-13 代入 2X+3Y=3 所以2X+3(4X-13)=3 解出X是3再把X=3代入其它式子求Y=-1
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2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
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x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
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