Կոտորակների բազմապատկումը,տեսանյութ

Դասագիրք 5-րդ դասարան,էջ 174

Վարժություններ 1247,1248,1250

1247
ա․1/5+1/5+1/5+1/5=4×1/5=4/5
բ․2/3+2/3+2/3+2/3+2/3=5×2/3=10/3
գ․4/3+4/3+4/3+4/3=4×4/3=16/3
դ․7/2+7/2+7/2=3×7/2=21/2

1248
ա․5 x 1/2 = 5/2
բ․3 x 5/2 = 15/2
գ․4 x 6/7 = 24/7
դ․2/5 x 2 = 4/5
ե․4/9 x 5 = 20/9
զ․2/3 x 7 = 14/3
1250
3/7 x 5/2 = 15/14
8/3 x 9/4 = 2/1 x 3/1 = 6/1
5/9 x 7/4 = 35/36
6/7 x 3/8 = 3/7 x 3/4 = 9/28
2/9 x 6/17 = 2/3 x 2/17 = 4/51
10/7 x 3/8 = 5/7 x 3/4 = 15/28
4/5 x 21/16 = 1/5 x 21/4 = 21/20
15/14 x 5/3 = 5/14 x 5/1 = 25/14
12/17 x 31/27 = 4/17 x 31/9 = 124/153
56/39 x 13/8 = 7/3 x 1/1 = 7/3
25/23 x 69/70 = 5/1 x 3/14 = 15/14
44/37 x 111/11 = 4/1 x 3/1 = 12/1
55/90 x 16/33 = 5/45 x 8/3 = 40/135
18/29 x 36/17 = 648/493
54/23 x 25/36 = 9/23 x 25/6 = 225/138
45/21 x 63/81 = 5/1 x 3/9 = 15/9