1-2 減去正數

減去正數：8 – 3 = ?

• 5
• –5
• 11
• 24

請選出正確的計算過程：1 – 3 = ?

• = 3 – 1 = 2
• = – ( 3 + 1 ) = – 4
• = – ( 3 – 1 ) = – 2
• = – ( 1 – 3 ) = – ( – 2 ) =+ 2

請選出正確的計算過程：3 – 9 = ?

• = 8 – 3 = 5
• = – ( 8 + 3 ) = – 11
• = – ( 8 – 3 ) = – 5
• = – ( 3 – 8 ) = – ( – 5 ) =+ 5

請選出正確的計算過程：10 – 27 = ?

• = – ( 27 + 10 ) = – 37
• = 27 – 10 = 17
• = – ( 27 – 10 ) = – 17

請選出正確的計算過程：2 – 12 = ?

• = – ( 2 + 12 ) = – 14
• = 12 – 2 = 10
• = – ( 12 – 2 ) = – 10
• = – ( 2 – 12 ) = – ( – 10 ) =+ 10

請選出正確的計算過程：( – 1) – 9= ?

• = – ( 9 – 1 ) = – 8
• = – ( 1 – 9 ) = – ( – 8 ) =+ 8
• = – ( 1 + 9 ) = – 10
• = 9 – (–1 ) = 9 + 1 = 10

請選出正確的計算過程：( – 4) – 6= ?

• = – ( 6 – 4 ) = – 2
• = – ( 4 – 6 ) = – ( – 2 ) =+ 2
• = – ( 4 + 6 ) = – 10
• = 6 – 4 = 2

3 – 8 = ?

• 5
• – 5
• 11
• –11

2 – 3 = ?

• 1
• – 1
• 6
• 5

3 – 1 = ?

• 2
• – 2
• 4
• – 4