x+y=42 0.8%x+1.1%y=42*1%「解方程组
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x+y=42 0.8%x+1.1%y=42*1%「解方程组
x+y=42 0.8%x+1.1%y=42*1%「解方程组
x+y=42 0.8%x+1.1%y=42*1%「解方程组
x+y=42 => y=42-x
0.8%x+1.1%y=42*1% => 8x+11y=420
=> 8x+11(42-x)=420
=> (11-8)x=(11-10)*42
=> 3x=42
=> x=14
=> y=42-x=28
∴x=14,y=28
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
化简 x / y(x+y) - y / x(x+y) =
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
5x-4y(y-x)=?
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+x+y=60 .x-y=4
4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=?
x+y=11 2x+4y=42 3y+x=31 求x y
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
y=x(x
3X+X=( ) Y+4Y-3Y=( )
x+y/y=5/4,则x/y=----------------
x*x+2x+y*y-4y+5=0 x= y=