A<0, b>0, c>0, (1) error;

When x=- 1, y = a-b+c.

Y = 4a2-2b+c < 0, (3) wrong;

-b/2a= 1，2a=-b，a-b+c & lt； 0.2a-2 b+ 2c & lt； 0,2c & lt3b, (4) right;

If a-b >; M(am+b), then a-b+c >; When Am2+bm+c, x=- 1, y is not the maximum value, not necessarily greater than the value of y when X=m, (5) Wrong.