4(x+y)=80 5(x-y)=80过程,
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4(x+y)=805(x-y)=80过程,4(x+y)=805(x-y)=80过程,4(x+y)=805(x-y)=80过程,4(x+y)=805(x-y)=80x+y=80/4=20x-y=80/5
4(x+y)=80 5(x-y)=80过程,
4(x+y)=80 5(x-y)=80
过程,
4(x+y)=80 5(x-y)=80过程,
4(x+y)=80 5(x-y)=80
x+y=80/4=20
x-y=80/5=16
(x+y)+(x-y)=2x=20+16=36
x=18
y=20-x20-18=2
x=18 y=2
x+y=20
x-y=16
2x=20+16=36
2y=20-16=4
x=18
y=2
4(x+y)=80 5(x-y)=80
即x+y=20 (1)
x-y=16 (2)
(1)+(2)
2x=36
x=18
y=20-x=2
x+y=20,x-y=16,两式相加,得:2x=36,x=18,y=2
5x-4y(y-x)=?
x+y/y=5/4,则x/y=----------------
已知:4x = 5y,求(x+y) :y
x*x+2x+y*y-4y+5=0 x= y=
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
x+x+y+y+y+y=80 x+x+y+y=40 问XY=?
x x y y y y=80 x x y y=40 问XY=?
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
x+y=80 5x+2.5y≤290 1.5x+3.5y≤212
y=|-x.x+4x+5|
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
(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/60+y/80=10,x/60+y/40=15、{2x/3+3y/4=1/5,5x/6-5y/2=2、{5/2(x+y)=1200,10/3(x+y)=1200{4x+5y=98,5y-4x=2、{x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x