Jawaban:

6. ¼

7. 50%

8. 0,0114286

9. 12 ⅗

10. 15 ⅖

11. 0,8

12. 2,1

13. 0,32

14. 2/7

15. 75,36 cm

16. 176 cm

17. 961,625 cm²

18. 15625 cm³

19. 3080 cm³

20. 5133,3 cm³

Penjelasan dengan langkah-langkah:

6. 25/100 = 1/4

7. 0,5 = 5/10 ×100% = 50%

8. 4/350 = 2/175 = 0,0114286

9. 3,15 = 315/100 = 63/5 = 12 3/5

10. 15+2/5 = 77/5 = 15 2/5

11. 30%+0,05 = 30/100+50/100 = 80/100 = 0,8

12. 4 3/5 - 2 1/2 = 23/5 - 5/2 = 21/10 = 2,1

13. 6/12×8/10×12/15 = 1/1×2/5×4/5 = 8/25 = 0,32

14. 5/10×12/30÷7/10 = 5/10×12/30×10/7 = 5/5×6/3×1/7 = 2/7

15. kll = 2×π×r = 2×3,14×12 = 75,36 cm

16. kll = 2×22/7×28 = 176 cm ( r = d/2 = 56/2 = 28 )

17. Luas = π×r² = 3,14×17,5×17,5 = 961,625 cm²

18. V kubus = S³ = 25³ = 15625 cm³

19. V tabung = π×r²×t = 22/7×7×7×20 = 3080 cm³

20. V kerucut= 1/3×π×r×r×t = 1/3×22/7×14×14×25 = 5133,3 cm³

semoga membantu dan bermanfaat.