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七上2-3分數的四則運算12

Authored by 黃俊賓 關山國中

Mathematics

7th Grade

Used 3+ times

七上2-3分數的四則運算12
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20 questions

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1.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1+3÷8

11÷8

3÷8

1.375

3.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

1項

2項

3項

4項

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1

2

3

4

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

| a + b + c |

| a+b−c |

| a−b+c |

| a−b−c |

6.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

如果 a 、b 是兩個不相同的分數,且 a<0 、b>0 ,那麼下列哪一個數一定是正數?

a+b

a−b

ab

b−a

Answer explanation

可用整數的觀念去解題

因為 a < 0 且 b > 0,

a + b =可能為負數,

設a=-1、b=2,a + b =-1+2=1 > 0

設a=-2、b=1,a + b =-2+1=-1 < 0

a - b =負數

設a=-1、b=2,a - b =-1-2=-3 < 0

設a=-2、b=1,a - b =-2-1=-3< 0

b - a可能為負數

設a=-1、b=2, b - a =2-(-1)=2+1=3 > 0

設a=-2、b=1, b - a =1-(-2)=1+2=3 > 0

ab=正數x負數=負數

7.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Answer explanation

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