Odpowiedź:
1. 4 5/6 + 3 1/10 = 4 50/60 + 3 6/60 = 7 56/60
2.4 27/100 - 1 3/5 = 4 27/100 - 60/100 = 3 127/100 - 60/100 = 3 67/100
3.3 2/7 × 1 4/10 = 22/7 × 14/10 = 22/1 × 2/10 (po skróceniu)=44/10 = 4 4/10
4. 21/4 × 100/125= 21/1 × 25/125(skracamy na ukos 4 i 100 przez 4)= 525/125 = 5 25/125
5. 3/10 + 8/10 × 1/2) ÷ 10= (3/10 + 5/5 )÷10 = 13/10 ÷ 1/10 = 13/100
6. (4 - 2 3/7) × (8,8 - 2,4) = 2 3/7 × 6,4 = 2 3/7 × 6 4/10= 17/7 × 64/10 = 17/7 × 64/10 (32/5 po skrocenou) = 544/35= 15 19/35
7. 30/3 × 4/ 5 + 2× 8 : 1 2/7 = 30-12/5+16 : 9/7 = 18/31 × 7/9 = 2/31 × 7/1 ( skracamy na ukos 18 i 9 przez 9) = 14/31
