2x-7y=8y-2x=32
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2x-7y=8y-2x=322x-7y=8y-2x=322x-7y=8y-2x=322x-7y=87y=2x-8y=(2x-8)/7(1)将(1)代入(2x-8)/7-2x=322x-8=(2x+32
2x-7y=8y-2x=32
2x-7y=8
y-2x=32
2x-7y=8y-2x=32
2x-7y=8
7y=2x-8
y=(2x-8)/7 (1)
将(1)代入
(2x-8)/7-2x=32
2x-8=(2x+32)*7
2x-8=14x+224
12x=-232
x=-58/3 (2)
将(2)代入(1)得:
-116/3-7y=8
-116-21y=24
y=-20/3 解得:x=-58/3,y=-20/3
把Y=32+2X代入1式,得
2X-7( 32+2X)=8,展开括号
2X- 224-14X-8=0
-12X+232=0
-12X=-232
X=58/3
把X=58/3代入2式得,
Y-2*58/3=32
Y=-20/3
2x-7y=8
y-2x=32
解:
2x-7y=8……①
y-2x=32……②
①试+②试→ -6y=40 y=20/3 将y=20/3代入①试
得x=58/3
解:2X-7Y+Y-2X=8+32
-6Y=40
Y=-20/3
所以,X=58/3
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