USM STAN 2013

Tukang Tanya
· 6 bulan yang lalu

Jika $1 over a plus 1 over b$ = 7 dan $1 over a minus 1 over b$ = 3, maka $1 over a squared minus 1 over b squared$ adalah ...
A. 4 D. 16
B. 7 E. 21
C. 10
Fahrizal
· 6 bulan yang lalu

$K U N C I colon E left parenthesis 1 divided by a squared right parenthesis minus left parenthesis 1 divided by b squared right parenthesis equals left parenthesis 1 divided by a plus 1 divided by b right parenthesis left parenthesis 1 divided by a minus 1 divided by b right parenthesis equals 7 x 3 equals 21$