设二次函数f(x)=ax
2+bx+c在区间[-2,2]上的最大值、最小值分别是M、m,集合A={x|f(x)=x}.
(1)若A={1,2},且f(0)=2,求M和m的值;
(2)若A={1},且a≥1,记g(a)=M+m,求g(a)的最小值.
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