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afla necunoscutele 5×b+25×6-72÷8=181

Răspuns :

5×b+25×6-72÷8=181
5×b+150-9=181
5×b+141=181
5×b=181-141
b=40:5
b=8
5 × b + 25 × 6 - 72 : 8 =1 81
× b + 150 - 9 = 181 
5 × b = 181 + 9 - 150 → metoda mersului invers
5 × b = 190 - 150 
5 × b = 40 
b = 40 : 5 
b = 8