4(x+2)=1-5x 3(y+2)=3-2 y/2+x/3=13 y/3-x/4=3 x+y=420 30%x+40%y=160*180% 2x-1/5+3y-2/4=2 3x+1/3-3y+2/4(x+2)=1-5x3(y+2)=3-2y/2+x/3=13y/3-x/4=3x+y=42030%x+40%y=160*180%2x-1/5+3y-2/4=23x+1/3-3y+2/4=4/3x/2+y/3=22x+3y=28
来源:学生作业学帮网 编辑:学帮网 时间:2024/05/18 00:19:59
4(x+2)=1-5x 3(y+2)=3-2 y/2+x/3=13 y/3-x/4=3 x+y=420 30%x+40%y=160*180% 2x-1/5+3y-2/4=2 3x+1/3-3y+2/
4(x+2)=1-5x
3(y+2)=3-2
y/2+x/3=13
y/3-x/4=3
x+y=420
30%x+40%y=160*180%
2x-1/5+3y-2/4=2
3x+1/3-3y+2/4=4/3
x/2+y/3=2
2x+3y=28
4x+8=1-5x
(4+5)x=1-8
x=-7/9
3y=1-6
y=-5/3;
y/2=13-x/3
y=26-2x/3
(26-2x/3)/3-x/4=3
-(2/9+1/4)x=3-26/3
x=12
y=26-24/3=18;
y=420-x
0.3x+0.4(420-x)=160*1.8
-0.1x=120
x=-1200
y=1620;
化简可得2x+3y=2.7 x-y=1/6
x=y+1/6 2(y+1/6)+3y=2.7
y=71/150
x=16/25;
化简3x+2y=12 2x+3y=28
两式相减.y-x=16,y=16+x
3x+32+2x=12
x=-4
y=12
y=12,x=-4
x=115
y=12,x=-4
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
3x-2y=1 4x-5y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
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
解下列方程组:{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0