Question

ex 2 va rog frumos ​

Answer 1

Răspuns:

a) {[(x-1):2]:3}:4=5

[(x-1):2]:3=5·4

(x-1):2=20·3

x-1=60·2

x=120+1

x=121

b) 24:[12-(6-x)]+2=5

24:[12-(6-x)]=5-2

12-(6-x)=24:3

-(6-x)=8-12

x=-4+6

x=2

c) {[(x-1)·2]:3}:4=5

[(x-1)·2]:3=5·4

(x-1)·2=20·3

x-1=60:2

x=30+1

x=31

d) 1+{2·[3+(4+x):5]-6}-7=8

2·[3+(4+x):5]=8+7-1

3+(4+x):5=14:2

(4+x):5=7-3

4+x=4·5

x=20-4

x=16

e) x+5=7⇒x=7-5⇒x=2

f)x-3=8⇒x=8+3⇒x=11

g) 7·x=28⇒x=28:7⇒x=4

h)4:x=2⇒x=4:2⇒x=2

Explicație pas cu pas: