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15. Rezolvati ecuatiile:
a) [ 15* (10*-11)-120] *10-125=25
b) 100*{10*[(45x-35) : 5+12 ] *2-21} +17 = 25917
Va rog ajutati-ma

Răspuns :

Adrianaboboc


[15*(10x-11)-120]*10=125+25=150

15*(10x-11)-120=150:10=15

15*(10x-11)=15+120=135

10x-11=135:15=9

10x=9+11=20

x=20:10=2

x=2