Question

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求解

9
9
2a
36
B
6
) 21 如右圖,ABIBC、ADI CD
AB = 2a - BC = 6 -
AD = 9 - CD = 36,
(2a - 36 )(2a + 36 ) = ?
(A) 15
(B)45
(C)54
(D117

Answer 1

才才

東西湊一湊通常就比較容易出現答案