解方程组x/y=5/4 x-1/y+2=2/3
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解方程组x/y=5/4x-1/y+2=2/3解方程组x/y=5/4x-1/y+2=2/3解方程组x/y=5/4x-1/y+2=2/3由x/y=5/4得x=5y/4---(1)x-1/y+2得x=2y+
解方程组x/y=5/4 x-1/y+2=2/3
解方程组x/y=5/4 x-1/y+2=2/3
解方程组x/y=5/4 x-1/y+2=2/3
由x/y=5/4 得 x=5y/4---(1)
x-1/y+2 得x=2y+7/3---(2)
(1)=(2)得 y=4,
代入(1)或(2)
得 x=5
当x=5,y=4时满足原方程组有意义
所以 x=5,y=4 .
x/y=5/4
(x-1)/(y+2)=2/3
y≠0,y≠-2:
4x = 5 y
3(x-1) = 2(y+2)
4x - 5 y = 0.....(1)
3x - 2y =7.....(2)
(1)*2-(2)*5:
8x-15x=-35
x=5
y=4/5x=4
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解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2
解二元一次方程组{x+y/2+x-y/3=6,4(x+y)-2=5(x-y)
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