Question

1) Calcule as multiplicações de números racionais
a)(+1/5).(+4/3)=
b)(+4/9).(-7/9)=
c)(-3/2).(-5/7)=
d)(-1/5).(+1/4)=
e)(-0,7).(-2/3)=​

Answer 1

Resposta:

a) (+ 1/5). (+ 4/3) = (1,4) / (5,3) 4/15 c) (- 3/2). (- 5/7) = (-3.-5) / (2.7) = 15/14 b) (+ 4/9). (- 7/5) = (-4,7) / (9,5) = -28/45 d) (- 1/5). (+ 1/4 ) = (-1,1) / (5,4) = -1/20 e) (+2/3). (- 1/3) = (2.-1) / (3,3) = -2/9 f) (- 5/8). (4/3) = (-5,4) / (8,3) = -20/24 (= 4) = -5/6 g) (+ 4/5). (- 1/3) = ( 4.-1) / (5.3) = -4/15 h) (- 3/5). (- 7/4) = (-3.-7) / (5,4) = 21/20