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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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