Привидите дробь 4/7 к новому знаменателю 14; 28; 49; 70; 210
14 : 7 = 2 - доп.множ = (4*2)/(7*2) = 8/14 28 : 7 = 4 - доп.множ. = (4*4)/(7*4) = 16/28 49 : 7 = 7 - доп.множ. = (4*7)/(7*7) = 28/49 70 : 7 = 10 - доп.множ. = (4*10)/(7*10) = 40/70 210 : 7 = 30 - доп.множ. = (4*30)/(7*30) = 120/210
1) 4/7 к 14 =2×7 4×2/14=8/14 ; 2) 4/7 к 28=7×4 = 4×4/28=16/28; 3) 4/7 к 49=7×7 4×7/49=28/49; 4) 4/7 к 70=7×10 4×10/70=40/70; 5) 4/7 к 210=7×30 4×30=210=120/210