0.4X-0.2Y=3.9 3/5X-4/5Y=1.7 X.Y等于多少
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0.4X-0.2Y=3.9 3/5X-4/5Y=1.7 X.Y等于多少
0.4X-0.2Y=3.9 3/5X-4/5Y=1.7 X.Y等于多少
0.4X-0.2Y=3.9 3/5X-4/5Y=1.7 X.Y等于多少
0.4X-0.2Y=3.9 3/5X-4/5Y=1.7 X.Y等于多少
{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4
(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
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(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
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
帮忙解一些方程组(1)3x-2y=6 2x+3y=17 (2)5x+6y=15.2 3x-2y=-0.4(3)2(x+y)-3y=7 4(x-9)=3(y-2)(4)3(x+y)-4(x-y)=4 x+y/2+x-y/6=1
解方程组:①4x+3y-5=0,x-2y-4=0.②5x-2=2(y-1),2(x-2)+(y-1)③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2
y=|-x.x+4x+5|
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
(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)