Question

4[9+6(m-7)]=8

(x+9)/9=6-(x+4)/5

3(b+5)=15
Urgent !​

Answer 1

4[9+6(m-7)]=8

(folosim distributivitatea)

4(9+6m-42)=8

(folosim distributivitatea)

36+24m-168=8 /+168

36+24m=174/-36

24m=138/:24

m=5,75

(x+9)/9=6-(x+4)/5

(Separam termenii cu necunoscuta de termenii liberi)

(x+9)/9+(x+4)/5=6

(aducem la același numitor 45,amplificand cu 5, respectiv 9)

5(x+9)/45+9(x+4)/45=6

(folosim distributivitatea)

5x+45/45+9x+36/45=6

14x+81/45=6/*45

14x+81=270/-81

14x=189/:14

x=13,5

3(b+5)=15

(folosim distributivitatea)

3b+15=15/-15

3b=0/:3

b=0

Succes!