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Hitunglah. 1. 6 + (-4) 2. (-1) + (-9) 3. (-7) – (+8) 4. (-2/3) – (-1/3)

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Hitunglah.

1.     6 + (-4)

2.     (-1) + (-9)

3.     (-7) – (+8)

4.     (-2/3) – (-1/3)

5.     -2 + 6 – 5 + 7

6.     3 – (+4) – (-9)

7.     (-8) × (+2)

8.     (-3/4)2

9.     0,4 × (-0,2)

10.  (-28) : (-4)

11.  9 : (-12)

12.  (-9/14) : (6/7)

Pembahasan:

1.     6 + (-4) = 6 – 4 = 2

2.     (-1) + (-9) = -1 – 9 = -10

3.     (-7) – (+8) = -7 – 8 = -15

4.     (-2/3) – (-1/3) = -2/3 + 1/3 = -1/3

5.     -2 + 6 – 5 + 7 = 6

6.     3 – (+4) – (-9) = 3 – 4 + 9 = 8

7.     (-8) × (+2) = -16

8.     (-3/4)2 = 9/16

9.     0,4 × (-0,2) = -0,08

10.  (-28) : (-4) = 7

11.  9 : (-12) = -3/4

12.  (-9/14) : (6/7) = -(9/14 × 7/6) = -3/4

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