(1)x-3y=2,y=x;(2)x+y=52x+y=8(3)4x+3y=5,x-2y=4;(4)m-n/2=22m+3
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(1)x-3y=2,
y=x;
(2)x+y=5
2x+y=8
(3)4x+3y=5,
x-2y=4;
(4)m-n/2=2
2m+3n=12.
必须要准的过程....步骤一定要对啊
y=x;
(2)x+y=5
2x+y=8
(3)4x+3y=5,
x-2y=4;
(4)m-n/2=2
2m+3n=12.
必须要准的过程....步骤一定要对啊
(1)x-3y=2______(1),
y=x;
把 y=x代入(1)得X-3X=2 X=-1即Y=-1
(2)x+y=5
2x+y=8
(2)-(1)得X=3,所以Y=2
(3)4x+3y=5,
x-2y=4;
(1)-(2)*4得;11Y=-11,Y=-1,代入(2)得X=2
(4)m-n/2=2
2m+3n=12.
(1)*2-(2)得-4n=-8 n=2代入(1)m=3
y=x;
把 y=x代入(1)得X-3X=2 X=-1即Y=-1
(2)x+y=5
2x+y=8
(2)-(1)得X=3,所以Y=2
(3)4x+3y=5,
x-2y=4;
(1)-(2)*4得;11Y=-11,Y=-1,代入(2)得X=2
(4)m-n/2=2
2m+3n=12.
(1)*2-(2)得-4n=-8 n=2代入(1)m=3
(1)x-3y=2,y=x;(2)x+y=52x+y=8(3)4x+3y=5,x-2y=4;(4)m-n/2=22m+3
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