а) 7/8, 3/4 и 1/2 = 7/8, 3*2/(4*2) и 1*4/(2*4) = 7/8, 6/8 и 4/8;б) 4/15 и 1 1/5 = 4/15 и (5+1)*3/(5*3) = 4/15 и 18/15;в) 3 1/2 и 1 2/3 = (3*2+1)*3/(2*3) и (3+2)*2/(3*2) = 21/6 и 10/6;г) 7 3/8 и 5/12 = (7*8+3)/8 и 5/12 = 59*3/(8*3) и 5*2/(12*2) = 177/24 и 10/24;д) 3 1/5 и 2 1/3 = (3*5+1)*3/15 и (2*3+1)*5/15 = 48/15 и 35/15;е) 2/3,1 3/4,5 1/2 и 7 5/6 = 2*4/12, (4+3)*3/12, (5*2+1)*6/12 и (7*6+5)*2/12 = 8/12, 21/12, 66/12 и 94/12.ж) 0,7 и 0,75 = 0,70 и 0,75;з) 1,405 и 0,45 = 1,405 и 0,450.