Răspunsuri

2014-08-16T14:27:06+03:00
3/6*9=  3/6 -3/9
3/9*12= 3/9 -3/12
3/12*15=3/12 -3/15
.................................
3/21*24=3/21 -3/24

S=3/6 -3/24

D=1/2 -1/8   aducem la acelasi numitor

S= (4-1)/8

S=3/8
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