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a) 3/7*5/9 = 1/7*5/3 = 5/21
4/3*7/16 = 1/3*7/4 = 7/12
6/11*5/9 = 2/11*5/3 = 10/33
b) 8/21*7/12 = 8/3*1/12 = 2/9
5/6*9/12 = 5/6* 3/4 = 5/2*1/4 = 5/8
4/7*21/36 = 4*3/36 = 3/9 = 1/3
c) 1 1/2*1 5/9 = 3/2*5/9 = 1/2*5/3 = 5/6
2 5/8*1 1/3 = 21/8*1/3 = 7/8
7 ( po kolei od lewej strony ):
6
1 2/7
7/20
1/16
3/14
1
8/23
2 2/3
8:
5/9
3/8
4/15
1 2/3
9:
2/3*3/5 = 2*1/5 = 2/5
Odp: Jęczmieniem została obsiana 2/5 gospodarstwa.
Liczę na naj bo się trochę rozpisałam