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:2024/07/11 11:23:05
![数学题 -1/2x+2(x-1/3y²)-(-3/2x+1/3y²),其中x2,y-2/3](/uploads/image/z/325352-56-2.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98+-1%2F2x%2B2%28x-1%2F3y%26%23178%3B%29-%28-3%2F2x%2B1%2F3y%26%23178%3B%29%2C%E5%85%B6%E4%B8%ADx2%2Cy-2%2F3)
x){6uӵ^.koTmQdW)[Xkjtn{cmNMR>L/kVmU^_g
RgQ`\c?VaO[<7LHW( 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