Question

Cate puteti doar cele notate cu ,,t” , dau coroana‍

Answer 1

Răspuns:

5. 100-[(b:2+5)+2xb]=5

(b:2+5)+2xb=100-5

(b:2+5)+2xb=95

Notăm b:2=x

(x+5)+4x=95

5x+5=95

5x=95-5

5x=90

x=90:5

x=18

b=2x18

b=36

v: 100-[(36:2+5)+2x36]=5

100-[(18+5)+72]=5

100-(23+72)=5

100-95=5

7.42:[c+(cx2-3)-25]=3

c+(cx2-3)-25=42:3

c+(cx2-3)-25=14

c+2c-3=14+25

3c-3=39

3c=39+3

3c=42

c=42:3

c=14

v: 42:[14+(14x2-3)-25]=3

42:[14+(28-3)-25]=3

42:(14+25-25)=3

42:14=3

8. a-5x4+a:12=136

Notăm a:12 cu x

12x-20+x=136

13x=136+20

13x=156

x=156:13

x=12

a=12x12=144

v: 144-20+12=136

9. a+a:2-a:4=70

Notăm a:4 cu x

4x+2x-x=70

5x=70

x=14

a=14x4

a=56

v: 56+56:2-56:4=70

56+28-14=70

Explicație pas cu pas: