Question

punctul b) va roog!Dau coroana!​

Answer 1

Răspuns:

folosim metoda inversă

Explicație pas cu pas:

[5•(5x-5)-120]•5= 125+25

= 150

5•(5x-5)-120=150:5

=30

5•(5x-5)=30+120

=150

5x-5=150:3

=30

5x= 30+5

=35

x= 35:5

x= 7

Answer 2

Răspuns:

b) [5*(5x-5)-120]*5-25=125

(25x-25-120)*5-25=125

(25x-145)*5-25=125

125x-725-25=125

125x-750=125

125x=125+750

125x=875

x=875:125

x=7.

Xenon54