Пошаговое объяснение:
28 * 2 3/4 = 28 * 11/4 = 7*11 / 1 = 77
1 3/5 * 2 1/2 = 8/5 * 5/2 = 8/2 = 4
3 1/6 * 24 = 19/6 * 24 = 19*4 / 1 = 76/1 = 76
7 7/12 * 12/21 = 91/12 * 12/21 = 91/21 = 4 7/21 =
4 1/3
121 * 4 1/11 = 121 * 45/11 = 11*45 / 1 = 495/1 = 495
10 1/4 * 1 1/41 = 41/4 * 42/41 = 42/4 = 10 2/4 =
10 1/2
Пошаговое объяснение:
28×2 3/4=28*11/4=77
1 3/5×2 1/2=8/5*5/2=4
3 1/6×24=19/6*24=76
7 7/12×12/21=91/12*12/21=13/3=
4 1/3
121×4 1/11=121*45/11=495
10 1/4× 1 1/41=41/4*42/41=21/2=
10 1/2
