是C先执行a-=a * a,相当于 a = a - a * a = 11 - 11 * 11 = -110然后执行a += a,也就是 a = a + a = (-110) + (-110) = -220
就是c,先算a=a-a*a,得a=-110,然后a=a+a得a=-220。有帮助的话采纳一下哦!