Выполни умножение смешанного числа на натуральное 3 1/4*12 7 3/16*4 6 25/26*2

3 1/4 * 12 = 3 * 12 + (1*12)/4 = 36 + 12/4 = 36 + 3 = 39

7 3/16 * 4 = 7 * 4 + (3*4)/16 = 28 + 12/16 = 28 12/16 = 28 3/4

6 25/26 = 6 * 2 + (25*2)/26 = 12 + 50/26 = 12 + 1 24/26 = 13 24/26 = 13 12/13

1)3,1/4×12=13/4×12/1=39 2)7,3/16×4=115/16×4/1=115/4=28,3/4 или 28,75 3)6,25/26×2=181/26×2/1=362/26=13,24/26