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[15X(10X-11)-120]X10-125=25
CERINTA:REZOLOVATII ECUATIILE profesoara zice ca-i prin metoda mersului invers dar nu-mi dau seama


Răspuns :

[15*(10x-11)-120]*10-125=25
[15*(10x-11)-120]*10=25+125
15*(10x-11)-120=150:10
15*(10x-11)=15+120
10x-11=135:15
10x=9+11
x=20:10
x=2