x+y+3=26 5x+3y+12>26×4.8 怎么解
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x+y+3=265x+3y+12>26×4.8怎么解x+y+3=265x+3y+12>26×4.8怎么解x+y+3=265x+3y+12>26×4.8怎么解x+y+3=26得到y=23-x然后将y=2
x+y+3=26 5x+3y+12>26×4.8 怎么解
x+y+3=26 5x+3y+12>26×4.8 怎么解
x+y+3=26 5x+3y+12>26×4.8 怎么解
x+y+3=26得到y=23-x
然后将y=23-x代入不等式
得到5x+3(23-x)+12>26*4.8
得到2x+69+12>26*4.8
得到2x>43.8
得到x>21.9
(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
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
三元一次方程组解法 4x+y-z=12 x+y+z=26 3x+2y+z=-5 x-y=1 x-y+5z=1 2x-y+z=18 急 急、、、、、、、、、、
计算题!【x+y+z=26;x-y=1;2x-y+z=18】!【x/3+y/5;x/2-2y/5=1】
2X=18-3Y=26-5Y X=?Y=?
解二元一次方程{5X-2y=3 X+6y=7 {5x+4y=-3 2x-3y=8 {x+Y+Z=26 x-Y=1 2x-Y+z =18{x/3+Y/5=3 X/2- 2Y/5=1 快 1 .{5X-2y=3 X+6y=7 2.{5x+4y=-3 2x-3y=8 3.{x+Y+Z=26 x-Y=1 2x-Y+z =18 4.{x/3+Y/5=3 X/2- 2Y/5=1
12y(x-y)^2-8(x-y)^3=?
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
x+y+3=26 5x+3y+12>26×4.8 怎么解
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5