Question

Va rog, repede,și cu rezolvări ! Dau coroana ! ​

Answer 1

Răspuns:

Explicație pas cu pas:

9.

a) 15% * 80min = $\frac{15}{100} * 80 = \frac{15*8}{10} = \frac{120}{10} = 12$ min

b)15% * 120 kg = $\frac{15}{100} *120= \frac{15*12}{10} = \frac{180}{10} = 18$ kg

c) 15%* 650 lei= $\frac{15}{100} * 650= \frac{15*65}{10} = \frac{975}{10} = 97,5$ lei

d) 15%*200 m = $\frac{15}{100} *200= \frac{15*20}{10} = 15*2= 30$ m

10.

a) [tex]\frac{x}{6} * 480 =120\\ [/tex]

se simplifica 6 cu 480 prin 6 si ramane :

$80x=120 <=> x=\frac{120}{80} = \frac{12}{8} = \frac{3}{2}$

b) $\frac{x}{18} * 648 = 36$

se simplifica 18 cu 648 prin 18 si ramane:

$36x=36 <=> x=1$

11.

a)

[tex]\frac{p}{100} * 640 = 80\\ \frac{64p}{10} = 80\\ \frac{32p}{5} = 80\\ 32p= 400\\ p=\frac{400}{32} = \frac{100}{8} = \frac{25}{2} = 12,5 %[/tex]

p=12,5 %

b)

[tex]\frac{p}{100} * 1200 = 1600\\ 12p =1600 |:4\\ 3p=400\\ p=\frac{400}{3} = 133,(3) [/tex]

p=133,3%

12.

a) o ora are 60min

$\frac{1}{3} * 60 = 20 min$

b)

o zi are 24 de ore

$\frac{2}{3} * 24= 16 ore$

c)

un an are 12 luni

$\frac{3}{4} * 12 = 9 luni$

13.

a)

un metru are 100 de cm

[tex]\frac{p}{100} * 100 = 15\\ p=15[/tex]

b)

o ora are 60min

[tex]\frac{p}{100} * 60= 10\\ \frac{6p}{10} = 10\\ 6p=100\\ p=\frac{100}{6} = \frac{50}{3} = 16,6 [/tex]

p=16,6%

c)

luna februarie intr un an bisect are 29 de zile

$\frac{p}{100} * 29 = 1\\p=\frac{100}{29} = 3,44 %$

p=3,44%

sper ca te am ajutat , coronita? :3