3/19 x-7/38x+2=-15/19

а)78/338 = 26*3/26*13 = 3/13

б)700/840 = 140*5/140*6 = 5/6

в)255/525 = 15*17/15*35 = 17/35

г)324/405 = 81*4/81*5 = 4/5

д)84*108      <u> 2*7*6*2*3*9*2</u>       

   ______ =    6*2*2*2*7*9*2  = 3/2 = 1 целая 1/2

   48*126

е)96*35*110      <u>8*3*4*35*11*10</u> 

  _________ =   3*11*8*10*3*35  = 4/3 = 1 целая 1/3

  33*80*105