Jika (1/a) + (1/b) = 7 dan (1/a) – (1/b) = 3, maka nilai (1/a)2 – (1/b)2 = …. A. 10 B. 72 C. 32 D. 21
Matematika
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Pertanyaan
Jika (1/a) + (1/b) = 7 dan (1/a) – (1/b) = 3, maka nilai (1/a)2 – (1/b)2 = ….
A. 10
B. 72
C. 32
D. 21
1 Jawaban
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1. Jawaban wuland02
(1/a)+(1/b)= 7
(1/a)+(1/b)= 3
(1/a)2-(1/b)2= ((1/a)+(1/b))x((1/a-1/b))
=7x3
=21 (D)