1. 13 × 1 7/65 - 15,3 =
= 13/1 × 72/65 - 153/10 =
1) 13/1 × 72/65 = 936/65 = 72/5 =
14 2/5
2) 14 2/5 - 153/10 = 72/5 - 153/10 = 144/10 - 153/10 = -9/10
2. 8 1/3 × 3,5 × 3/25 × 6,25 ÷ 1/5 ÷ 1/16
1) 15/3 × 35/10 = 5/1 × 7/2 = 35/2 = 17 1/2
2) 35/2 × 3/25 = 105/50 = 21/10 = 2 1/10
3) 21/10 × 625/10 = 21/10 × 125/2 = 2625/20 = 525/4 = 131 1/4
4) 525/4 ÷ 1/5 = 525/4 × 5/1 = 2625/4 = 656 1/4
5) 2625/4 ÷ 1/16 = 2625/4 × 16/1 = 42000/4 = 10500