作业帮数学题 -1/2x+2(x-1/3y²)-(-3/2x+1/3y²),其中x2,y-2/3
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/28 14:31:34
x){6uӵ^.koTmQdW)[Xkjtn{cmNMR>L/k Vm U^_g
RgQ`\ c?Va O[<7 LHW( gko a>0շ55 $ف ay
数学题 -1/2x+2(x-1/3y²)-(-3/2x+1/3y²),其中x2,y-2/3
数学题 -1/2x+2(x-1/3y²)-(-3/2x+1/3y²),其中x2,y-2/3
数学题 -1/2x+2(x-1/3y²)-(-3/2x+1/3y²),其中x2,y-2/3
-1/2x+2(x-1/3y²)-(-3/2x+1/3y²),
=-1/2x+2x-2/3y^2+3/2x-1/3y^2
=3x-y^2
将x=2,y=2/3代入,得
=3*2-(2/3)^2
=6-4/9
=5又5/9=50/9