Question

Dau coroana!!Ex:1,2,3,4/pg 71.Vă rog!!

Answer 1

1. a-b=55
a:b=6=>a=6b
6b-b=55
5b=55=>b=55:5=>b=11
a=b6=>a=6x11=>a=66

2. dulceata=serbet+12
serbet=dulceata:4=> dulceata=4xserbet
cate kg de serbet a fact gospodina?
4xserbet=serbet+12
4xserbet-serbet=12
3xserbet=12=>serbet=12:4
serbet=4kg
cate kg de dulceata a facut gospodina?
dulceata=serbet+12
dulceata=4+12
dulceata=16kg

3.o tarta+o tarta/2=6 lei (aduc la acelasi nu mitor)
2tarta/2+tarta/2=6
3 tarta/2=6=> 3 tarta=6x2
                      3 tarta=12=> tarta=12:3
                                            tarta=4 lei
sau o alta varianta in caz ca nu ai invatat fractii..
 un intreg si jumatate=6 lei. un intreg=2 jumatati.
doua jumatati+o jumatate=6 lei
3 jumatati=6 lei=> o jumatate=6 lei:3=> o jumatate=2 lei.
un intreg=2 jumatati
o jumatate=2 lei din astea doua => un intreg =2x2 lei=> un intreg = 4 lei.
daca o tarta= 1 intreg=> o tarta= 4 lei

4. a,b,c
b=ax2=>b=2a
c=a+b
c=a+ax2=>c=3a
c-b=12
3a-b=12
3a-2a=12
a=12
c=3x12=>c=36
b=2x12=>b=24
verificam:
b=ax2?
24=12x2?
24=24 (adevarat)
c=a+b?
36=12+24?
36=36 (adevarat)
c-b=12?
36-24=12?
12=12 (adevarat)