Mathematics
Junior High
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ここってあってますか?
()(a+5) (a-5) (3) (x+5) (x-9)
(1) (x-4)²
= x²-8x+16
= a²-25
=
= x²-4x-45
(4)(x+1)(x+7) (5) (I+a)²
= x²+8x+7
2
=1+2a+a²
(6) (3+x) (x-3)
= x²-9
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