解方程组:x/2+y/3=1 x*20%+y*30%=14*10%
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解方程组:x/2+y/3=1 x*20%+y*30%=14*10%
解方程组:x/2+y/3=1 x*20%+y*30%=14*10%
解方程组:x/2+y/3=1 x*20%+y*30%=14*10%
x/2+y/3=1 (1)
x*20%+y*30%=14*10%(2)
(1)两边同乘以6得
3x+2y=6(3)
(2)两边同乘以10得
2x+3y=14(4)
(4)×3-(3)×2得
5y=30
y=6
把
y=6代人(3)得
3x+2×6=6
3x=﹣6
x=﹣2
所以方程组的解是x=﹣2 y=6
x/2+y/3=1
x*20%+y*30%=14*10%
3x+2y=6
2x+3y=14
6x+4y=12
6x+9y=42
5y=30
y=6
x=-2
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