3x+5y=430 5x+3y=450 x=?y=?
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3x+5y=4305x+3y=450x=?y=?3x+5y=4305x+3y=450x=?y=?3x+5y=4305x+3y=450x=?y=?式1:3x+5y=430式2:5x+3y=450两式相加
3x+5y=430 5x+3y=450 x=?y=?
3x+5y=430 5x+3y=450 x=?y=?
3x+5y=430 5x+3y=450 x=?y=?
式1:3x+5y=430
式2:5x+3y=450
两式相加
8x+8y=880 所以x+y=110式3
所以3x+3y=330式4
式1-式4得到2y=100所以y=50
x=60
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x+5y=430 5x+3y=450 x=?y=?
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
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