解方程组 2x+y=(4x-y-1)/2=(10+6x+2y)/4
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解方程组2x+y=(4x-y-1)/2=(10+6x+2y)/4解方程组2x+y=(4x-y-1)/2=(10+6x+2y)/4解方程组2x+y=(4x-y-1)/2=(10+6x+2y)/42x+y
解方程组 2x+y=(4x-y-1)/2=(10+6x+2y)/4
解方程组 2x+y=(4x-y-1)/2=(10+6x+2y)/4
解方程组 2x+y=(4x-y-1)/2=(10+6x+2y)/4
2x+y=(4x-y-1)/2=(10+6x+2y)/4
4x+2y=4x-y-1 8x+4y=10+6x+2y
3y=-1 2x+2y=10 x+y=5
y=-1/3 x=16/3
解法2 :
2x+y=(4x-y-1)/2=(10+6x+2y)/4
各项同时乘以4得
4(2x+y)=2(4x-y-1)=10+6x+2y
于是得
8x+4y=8x-2y-2 ①
8x+4y=10+6x+2y ②
由①得
y=-1/3
化简②得
x+y=5
y=-1/3代入②得
x=16/3
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