[2(a-2)]²-4×(a-2)×(-4)=?a=?
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[2(a-2)]²-4×(a-2)×(-4)=?a=?
[2(a-2)]²-4×(a-2)×(-4)=?
a=?
[2(a-2)]²-4×(a-2)×(-4)=?a=?
原式=4(a-2)²-(4a-8)×(-4)
=4a²-4+16a+32
=4a²+16a+28