Question

若3a²-a-2=0,则5+2a-6a²

Answer 1

,我的步骤很详细

3a2-a-2=0

(3a+2)(a-1)=0

若3a+2=0,a-1不等于0时,a=-2/3

若a-1=0,3a+2=0不等于0时,a=1

当a=-2/3时,则5+2a-6a²=5+2（-2/3）-6（-2/3）a²=3

当a=1时,则5+2a-6a²=5+2x1-6x1²=1

那个答案肯定错了!