Question

Calculaţi: a)1,(3) - 0,75; b)0, 0,6(1). 36; c)10,8 1,6); d) 0,41(6): 1,2.​

Answer 1

Vom efectua calculele:

a)

1,(3) - 0,75=

Transformam in fractii ordinare:

$\frac{13-1}{9}-\frac{75}{100} =\frac{4}{3}-\frac{3}{4} =\frac{7}{12}=0,58(3)$

c)

10,8-1,6=9,2

10,8×1,6=

$\frac{108}{10}\times \frac{16}{10}= \frac{1728}{10}=172,8$

10,8+1,6=12,4

10,8:1,6=6,75

d)

0,41(6):1,2=

Transformam in fractii ordinare:

$\frac{416-41}{900}:\frac{12}{10}$

Transformam in inmultire prin rasturnarea celei de-a doua fractii

$\frac{375}{900}\times \frac{10}{12}=\frac{375}{90}\times\frac{1}{12} =\frac{25}{6}\times\frac{1}{12}=\frac{25}{72}= 0,347(2)$