Question

ex 2 a b si c va roggg
pana la ora 15
pe o foaie va roggg
ofer coroană ​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

$3,(3) \times 0,24$

$= \frac{33 - 3}{9} \times \frac{24 {}^{(4} }{100}$

$= \frac{30 {}^{(3} }{9} \times \frac{6}{25}$

$= \frac{ \not10}{ \not3} \times \frac{ \not6}{ \not25} = 2 \times \frac{2}{5} = \bf{} \frac{4}{5}$

b)

$0,2(6) \times 2,5$

$= \frac{26 - 2}{90} \times \frac{25 {}^{(5} }{10}$

$= \frac{ \not24}{ \not90} \times \frac{ \not5}{ \not2} = \frac{12 {}^{(6} }{18} = \bf{} \frac{2}{3}$

c)

$2,(6)\times 0,8(3)$

$= \frac{26 - 2}{9} \times \frac{83 - 8}{90}$

$= \frac{24 {}^{(3} }{9} \times \frac{75 {}^{(15} }{90}$

$= \frac{ \not8}{3} \times \frac{5}{ \not6} = \frac{4}{3} \times \frac{5}{3} = \bf{} \frac{20}{9}$

Answer 2

Răspuns:

Explicație pas cu pas:

a) 3,(3)·0,24=(33-3)/9·0,24=30/9·0,24=(10/3)·(24/100)=(10·24)/(3·100)= 24/(3·10)=8/10=4/5          

b) 0,2(6)·2,5=(26-2)/90·(25/10)=(24/90)·(25/10)=(8/30)·(5/2)= (8·5)/(30·2)=8/(6·2)=4/(3·2)=2/3                    

c) 2,(6)·0,8(3)=(26-2)/9·(83-8)/90=24/9·(75/90)=(8/3)·(15/18)=(8·15)/(3·18)=

(8·5)/18=(4·5)/9=20/9