-3x²-x+1=-3(x²+(1/3)x)+1=-3(x²+(1/3)x+(1/6)²)+1+(1/12)=-3(x+(1/6))²+(13/12)所以当x=-1/6时,代数式取最大值13/12
-3x^2-x+1=-3(x^2+x/3-1/3) =-3(x+1/3)^2+4/3当x= -1/3 时,代数式-3x^2-x+1的最大值为 4/3.
-3x^2-x+1=-3(x+1/6)^2+13/12x=-1/6最大值为13/12