(1/2+1/3)×(1/5-1/4)=? 4 2/3+1/4×(1 7/9-4/9)=? (3 1/3×3²-17): 13-0,07=? , подробно.

1) (1/2+1/3)×(1/5-1/4)=(3+2 / 6)×(4-5 / 20)= 5/6 × (-1/20) = -5/120 = -1/24

2) 4 2/3+1/4×(1 7/9-4/9) = 14/3+1/4 ×(16/9-4/9) = 14/3+1/4×12/9=14/3+1/4×4/3=14/3+1/3=15/3=5

3) (3 1/3×3²-17):13-0,07=(10/3×9-17)÷13-0.07=(30-17)÷13-0.07=13÷13-0.07=1-0.07=0.93