1. 

   longfello New Member

   0.2*(4 х+5)=18

    

   longfello, 29 янв 2010

   #1
2. 

   1980GS New Member

   0,2•(4х+5)=18
   4х+5=18:0,2
   4х+5=90
   4х=90-5
   4х=85
   х=85:4
   х=21,25
   проверка:
   0,2•(4•21,25+5)=18
   0,2•90=18
   18=18

    

   1980GS, 29 янв 2010

   #2