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แบบฝกหัดที่ 4

1. จงทําใหเปนผลสําเร็จ
1. (-12) – 7

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2. 7 – (-12)

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3. (-8) – (-5)
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4. (-5) – (-8)
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5. [8 – (-2)]– 6
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6. 8 –[(-2) – 6]
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2. จงหาคาของ a – b และ b – a เมื่อกําหนด a และ b ดังตอไปนี้

1. a = 5, b = (-3)
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2. a = (-14), b = (-6)
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3. a = (-4), b = (-4)

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