y+x=1200 200x=120y=216000

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y+x=1200200x=120y=216000y+x=1200200x=120y=216000y+x=1200200x=120y=216000你题目错了200X=120Y20X=12Y20X=12(

y+x=1200 200x=120y=216000
y+x=1200 200x=120y=216000

y+x=1200 200x=120y=216000
你题目错了
200X=120Y
20X=12Y
20X=12(1200-X)
20X=14400-12X
32X=14400
X=450
Y=750
但200X=120Y=90000

题错了

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = 填空：x-y/x+y=( )/x^2-y^2 （x-y)2•(y-x)³(x-y)=? y+y'-2y=2x 微分方程y - 2y' + y = x (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 (x-4y)(2x+y)= (x+y)(2x-3y)=? x+y>=2,x-y x+y>=2,x-y y'-2y=(e^x)-x y'+2y/x=x通解 dy/dx=(2x*x*x*y-y*y*y*y)/(x*x*x*x-2x*y*y*y) x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?