Question

математика помогите плиз номера сделайте 17,19,20,22 на мера г,д,е

Answer 1

17. г) ⅔+⅞=(2×8)/24 + (7×3)/24 = (16+21)/24=37/24 = 1 13/24
д) 3/4 - 1/6 = (3×3)/12 - (1×2)/12 = (9-2)/12 =7/12
е) 5/6 + 1/9= (5×3)/18 + (1×2)/18 = (15+2)/18=17/18
19. г) 5¾-2=3¾
д) 3-5/7=21/7 - 5/7 = 16/7 = 2 2/7
е) 4- 1 7/9 = 3 - 7/9 = 27/9 - 7/9 = 20/9 = 2 2/9
20. г) 7/8 : 7/16 = 7/8 × 16/7 = 2
д) 27/40 : 18/35 = 27/40 × 35/18 = (9×3)/(5×8) × (5×7)/(9×2) = 3/8 × 7/2 = 21/16 = 1 5/16
е) 8/9 : 6 = 8/9 × 1/6 = (4×2)/9 × 1/(2×3) = 4/9 × 1/3 = 4/27
22. г) 3⅓ × 3/5 = 4/3 × 3/5 = 4/5
д) 3⅓ :30= 4/3 × 1/30 = 4/90 = 2/45
е) 6: 1½ = 6/1 × 2/3 = 12/3 = 4