TD's answer to TD's Secondary 2 Maths Singapore question.
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Using a2-b2
(a+b)(a-b)
(22.5+2.5)(22.5-2.5)
(25)(20)
500
(a+b)(a-b)
(22.5+2.5)(22.5-2.5)
(25)(20)
500
Date Posted:
3 years ago