{2x+20y=100 50x+40y=50怎么解?请写清楚,尤其是中间过程!
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x=y*20+100,x=y*25-50]
[20y+100=x,25y-50=x]
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
求几个方程组的答案 {2x+y=2 {3x-y=7 x=?y=?{x+2y=50 {3x=2y+6 x=?y=?{x+y=40 {10x+8y=370 x、y=?{x+y=5.8 {y=3x+0.6 x=?y=?
X+Y=40,(X*Y)/(X+Y)=7.5
方程组:2Y-X=X-2Y+20 Y-2X+50=2X-Y X=( ) Y=( )
已知:x(x-50y)+xy=50y^2,求:(x-y):y=?
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
1.6x=5y300+4x+100=4y2.4(x+y)=805(x-y)=803.y-x=45(85%y-x)8=(y-35-x)x24.0.7(1+40%)x+0.9(1+40%)y=399(1+40%)x+((1+40%)y=4905.x+y/2=502/3x+y=506.x+y=3002.89%乘3x+2.7%乘3y(1-20%)=32338.2-30000
y+y'-2y=2x
微分方程y - 2y' + y = x
(x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一