Mathematics
Junior High
Resolved
7〜11あってますか?
J
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(x + 2)² = (x + ²) (x+2)
= x²+2x+2x + 4
= x² + 4x +4
8 (3a-2b)² = (3a − 2b) (3a-2b)
= 9a - bab-bab +4b²
= αa +46²
(x+3)(x-3)=x²-3x + 3x-9
® (12 + x) (x - 12) = 12x − 144 + x² - 12x
=x²-144
(x-y+z) (x +y = z) = x² + y −2x - xy - y² + 2y + 2x +2y-4
-ử gỉ5y -4
+
® (x - 5y) - (x + 3y) (x - 3y)
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11ありがとうございます。12も分からなくて手がつかなかったので嬉しいです。ありがとうございます。