x+y=60 2%x+5%y=2.4怎么解
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x+y=60 2%x+5%y=2.4怎么解
![x+y=60 2%x+5%y=2.4怎么解](/uploads/image/z/19595652-60-2.jpg?t=x%2By%3D60+2%25x%2B5%25y%3D2.4%E6%80%8E%E4%B9%88%E8%A7%A3)
2%x+5%y=2.4
2x+5y=240
x+y=60
2x+2y=120
x=20 y=40
2x+5y=240
x+y=60
2x+2y=120
x=20 y=40
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
X+Y=5.7 1/4X+2/5Y=4/5X 怎么解
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已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
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这题怎么解?X-Y=4,2X+Y=20,X=?Y=?3X+2Y=14,2X-3Y=5,X=?Y=?
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先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
(60X-y)÷60+5+y÷100=X这个方程怎么解
解方程{2x+y=2、-x+y-5