⑴ X-3Y=2 ⑵ X+Y=5 ⑶ 4X+3Y=5 ⑷ M-N/2=2
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⑴ X-3Y=2 ⑵ X+Y=5 ⑶ 4X+3Y=5 ⑷ M-N/2=2
Y=X 2X+Y=8 X-2Y=4 2M+3N=12
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Y=X 2X+Y=8 X-2Y=4 2M+3N=12
求求求求求求求,你要好多金我都给
(1):X-3Y=2 ①
Y=X ②
将②代入①,得 X-3X=2
-2X=2
X=-1
(2):X+Y=5 ①
2X+Y=8 ②
②-①,得 X=3
将X=3代入①
Y=2
(3):4X+3Y=5 ①
X-2Y=4 ②
②*4,得4X-8Y=16③
①-③,得11Y=-11
Y=-1
将Y=-1代入②,得X=2
(4):M-N/2=2 ①
2M+3N=12 ②
①*2,得2M-N=4 ③
②-③,得4N=8
N=2
将N=2代入③,得M=3
Y=X ②
将②代入①,得 X-3X=2
-2X=2
X=-1
(2):X+Y=5 ①
2X+Y=8 ②
②-①,得 X=3
将X=3代入①
Y=2
(3):4X+3Y=5 ①
X-2Y=4 ②
②*4,得4X-8Y=16③
①-③,得11Y=-11
Y=-1
将Y=-1代入②,得X=2
(4):M-N/2=2 ①
2M+3N=12 ②
①*2,得2M-N=4 ③
②-③,得4N=8
N=2
将N=2代入③,得M=3
⑴ X-3Y=2 ⑵ X+Y=5 ⑶ 4X+3Y=5 ⑷ M-N/2=2
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