
七年級1-4~2-1練習7
Authored by 黃俊賓 關山國中
Mathematics
9th Grade
Used 3+ times

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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
8
24
32
46
Answer explanation
24=2×2×2×3
2.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
下列算式中,何者的值與其他三個算式的值不同?
2×3×4
(−2) × (−3) ×4
2× (−3) ×4
2× (−3) × (−4)
Answer explanation
其他選項都有兩個負數,所以選C
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
計算 9999×482=?
4819508
4819518
4819498
4819478
Answer explanation
9999×482=(10000-1)×482=4820000-482=4819518
4.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
某生將一正整數 a 分解成質因數相乘,計算過程如圖,則下列哪一個選項是正確的?
a=2×3²×5×7×11
b=2×3×5×7×11
c=3²×5×7×11
d=5×7
Answer explanation
e=7×11,d=5×7×11
c=3×5×7×11,b=2×3×5×7×11
a=22×3×5×7×11
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列何者是 0.000815 的科學記號?
8.15×10⁻³
8.15×10⁻⁴
815×10⁻³
815×10⁻⁶
Answer explanation
0.000815=8.15×10-4
6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下列選項的算式,何者的計算結果為正數?
2× (−3) × (−4) × (−5)
(−2) × (−3) × (−4) × (−5)
(−2) × (−3) ×4× (−5)
7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
若 A×567=7896,則 A×30× (−567) =?
−5760
−189420
−21590
−236880
Answer explanation
A×30×(-567)
=〔A×567〕×(-30)
=7896×(-30)
=-236880
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