Question

Calculați: a) 1 8/9 + 3 4/15 b) -17/16 + 5/24 c) 12/35 × (-5/6) d) 11/22 ÷ 17/15​

Answer 1

Răspuns:

a) 1 8/9 + 3 4/15 =

(9/9+8/9)+[(3×15)/15+ 4/15]=

17/9+49/15=

Numitor comun 45

(17×5+49×3)/45=

(85+147)/45=

232/45=

5 7/45

b) -17/16 + 5/24 =

Numitor comun :48

(-17×2+5×2)/48=

(-34+10)/48=

-24/48=

-1/2

c) 12/35 × (-5/6) =

- 12×5 / 35×6=

Simplificam

-2×1/ 7×1=

-2/7

d) 11/22 ÷ 17/15​=

11/22 ×15/17=

1/2×15/17

1×15/ 2×17=

15/34

Explicație pas cu pas: