Question

va rog am nevoie pana la ora 14

Answer 1

1)a)10,08-3,2:0,8=10,08-4=6,08
Sau
$\frac{24}{10} \times \frac{42}{10} - \frac{32}{10} \times \frac{5}{4} = \\ \frac{12}{5} \times \frac{21}{5} - \frac{8}{2} =$

$\frac{252}{25} - 4 = \frac{252 - 25 \times 4}{25} = \\ \frac{252 - 100}{25} = \frac{152}{25} = 6.08$
152:25=6,08
150
==20
.......0
.......200
.......200
......===

B)4,5+3,1x2,6=4,5+8,06=12,56

$\frac{45}{10} + \frac{31}{10} \times \frac{26}{10} = \\ \frac{45}{10} + \frac{31 \times 13}{5 \times 10}$



$\frac{45}{10} + \frac{403}{50} = \frac{5 \times 45 + 403}{50} \\ = \frac{225 + 403}{50} = \frac{628}{50} = 12.56$


C)34,5+9,11-1,4375+3,1(6)=45,3391(6)


$\frac{345}{10} + \frac{911}{100} - \frac{92}{10} \times \frac{10}{64} + \frac{316 - 31}{90} =$


$\frac{345}{10} + \frac{911}{100} - \frac{23}{16} + \frac{285}{90} = \\ \frac{69}{2} + \frac{911}{100} - \frac{23}{16} + \frac{57}{18} =$

$\frac{14400 \times 69 + 288 \times 911 - 1800 \times 23 + 57 \times 1600}{28800}$


$= \frac{993600 + 262368 - 41400 + 91200 }{28800}$


$\frac{1305768}{28800} = 45.3391(6)$



2)a)25,41-3x1,9=25,41-5,7=19,71

B)11,18:(9,4-2x0, 4)=11,18:(9,4-0,8)=11,18:8,6=1,3