Baiklah untuk soal selanjut nya…
Hitungan dengan Penjumlahan dan Pengurangan
1. (-3) + (+2) – (+5)
2. (+6) – (-7) + (-13)
3. (-6) – (+1) + (-3) – (-8)
4. 3 – 8
5. -6 + 9
6. -7 – 4
7. -18 + 18
8. 5 – 19
9. -2 + 6 – 8
10. 7 – 9 – 5
11. 4 – 7 + 10 – 1
12. -12 + 4 – 3 + 7
13. 0,4 – 1,9
14. -1,3 + 2,7
15. (-2/5) – (3/5)
16. (4/9) – (5/6)
17. -2 + (-10) – 6
18. 13 + (-2) – 5 – (-7)
19. -7 – (+8) – (-3) + 9
20. 1 + (-0,6) – 0,8
21. (-1/3) + (1/6) – (-2/3)
Pembahasan:
1. (-3) + (+2) – (+5) = -3 + 2 – 5 = -6
2. (+6) – (-7) + (-13) = 6 + 7 – 13 = 0
3. (-6) – (+1) + (-3) – (-8) = -6 – 1 – 3 + 8 = -2
4. 3 – 8 = -5
5. -6 + 9 = 3
6. -7 – 4 = -11
7. -18 + 18 = 0
8. 5 – 19 = -14
9. -2 + 6 – 8 = -4
10. 7 – 9 – 5 = -7
11. 4 – 7 + 10 – 1 = 6
12. -12 + 4 – 3 + 7 = -4
13. 0,4 – 1,9 = -1,5
14. -1,3 + 2,7 = 1,4
15. (-2/5) – (3/5) = –2/5 – 3/5 = –5/5 = -1
16. (4/9) – (5/6) = 8/18 – 15/18 = –7/18
17. -2 + (-10) – 6 = -2 – 10 – 6 = -18
18. 13 + (-2) – 5 – (-7) = 13 – 2 – 5 + 7 = 13
19. -7 – (+8) – (-3) + 9 = -7 – 8 + 3 + 9 = -3
20. 1 + (-0,6) – 0,8 = 1 – 0,6 – 0,8 = -0,4
21. (-1/3) + (1/6) – (-2/3) = –2/6 + 1/6 + 4/6 = 3/6 = ½
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