1.4Y=X 5X+6Y=39
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1.4Y=X5X+6Y=391.4Y=X5X+6Y=391.4Y=X5X+6Y=39把X=1.4Y代入第2个式子里面5*1.4Y+6Y=39得出13Y=39算出Y=3然后就可以找到X=1.4*3=4.
1.4Y=X 5X+6Y=39
1.4Y=X 5X+6Y=39
1.4Y=X 5X+6Y=39
把X=1.4Y代入第2个式子里面5*1.4Y+6Y=39得出13Y=39算出Y=3然后就可以找到X=1.4*3=4.2
1.4Y=X 5X+6Y=39
(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5
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x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(5x-6y)(x+y)=0(x不等于y),则y/x=
数学一元二次方程组1.4/x+y+6/x-y=39/x-y-1/x+y=1用换元法求
(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
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
1:4(x-100)+3y=5 2:6(x-y)-2(x+y )=14 x-100=-y 3(x-y)+(x+y)=5 先无视上面的1.4(x-100)+3y=5x-100=-y2.6(x-y)-2(x+y )=143(x-y)+(x+y)=5
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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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化简 x / y(x+y) - y / x(x+y) =
(X-Y)(X+Y)=5 能解么
5x-4y(y-x)=?
3x+5y-(x+y)=6 2(x+y)-3x=-7