Question

Efectuaţi:
$( \frac{1}{4} + \frac{7}{6} ) \times \frac{15}{34} + \frac{3}{2} \times ( \frac{1}{3} - \frac{1}{21} )$
Repede vă rog! !!!....​

Answer 1

( 1 / 4 + 7 / 6 ) × 15 / 34 + 3 / 2 × ( 1 / 3 - 1 / 21 ) =

( 3 / 12 + 14 / 12 ) × 15 / 34 + 3 / 2 × ( 7 / 21 - 1 / 21 ) =

17 / 12 × 15 / 34 + 3 / 2 × 6 / 21 =

255 / 408 + 18 / 42 =

1785 / 2856 + 1224 / 2856 =

3009 / 2856 = 59 / 56