Question

Transforma fractiile ordinare in fractii zecimale si efectueaza operatiile date.

a)3/5 x 1,5
b)42/5 : 8,4
c)5/2 x 2,7
d)7,4 : 2,5
e)5,6 : 12/10
f)3,7 x 9/6
g)5,6 x 3/2 : 0,5
h)11/4 x 2,3 : 3/5

Answer 1

$\it a)\ \dfrac{3}{5}\cdot1,5=0,6\cdot1,5=0,9\\ \\ b)\ \dfrac{42}{5}:8,4=8,4:8,4=1\\ \\ c)\ \dfrac{5}{2}\cdot2,7=2,5\cdot2,7=6,75$

Answer 2

Răspuns:

a) 3/5 x 1,5=

2(3/5)×15/10=

6/10×15/10=

90/10=9

b) 42/5 : 8,4=

2(42/5):84/10=

84/10:84/10=1

c) 5/2 x 2,7 =

5/2× 27/10=(5×27)/20

=27/4=6,75

d) 7,4 : 2,5=

74/10:25/10=

74/25=2,96=296/100

e) 5,6 : 12/10=

56/10:12/10 = 56/12=14/3

f) 3,7 x 9/6=

37/10×96/10=

(37×96)/100=

3552/100=1776/50=35,52

g) 5,6 x 3/2 : 0,5=

56/10×3/2:5/10=

56/10×3/2×10/5=

(56×3×10)/(10×2×5)=

1680/100=168/10=16,8

h) 11/4 x 2,3 : 3/5=

11/4×23/10:35/10=

(11×23×10) / (4×10×35)=

(11×23)/(4×35)=253/140=18,07143

Explicație pas cu pas: