1/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1),其中a=-2,x=3

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1/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1),其中a=-2,x=31/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1),其中a=-2,x=31/3(-3ax^2-ax+

1/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1),其中a=-2,x=3
1/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1),其中a=-2,x=3

1/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1),其中a=-2,x=3
1/3(-3ax^2-ax+3)-(-ax^2-1/2ax-1)
=-ax^2-1/3ax+1+ax^2+1/2ax+1
=1/6ax+2
当a=-2,x=3时
原式=1/6×(-2)×3+2=1

两个变量数值你都有,代入值就出来了