Question

91=(45+b)/9+9x9
va rog rezolvarea acestui exercitiu

Answer 1

       [tex]91= \frac{45+b}{9} +9*9\\\\ 91= \frac{45+b}{9}+81\\\\ (aducem~tot~la~acelas~numitor~si~scapam~de~numitor)\\ 91*9=45+b+81*9\\ 819=45+b+729\\ 45+b=819-729\\ 45+b=90\\ b=90-45\\ b=45\\\\ [/tex]