
数A 数学と人間の活動
Quiz
•
Mathematics
•
10th Grade
•
Practice Problem
•
Hard
Masaaki Yabugami
FREE Resource
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7 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
12の約数をすべて求めよ。
0,1,2,3,4,6
0,1,2,3,4,6,12
1,2,3,4,6,12
±1,±2,±3,±4,±6,±12
±0,±1,±2,±3,±4,±6,±12
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
6の倍数は?
6,12,18,…
0,6,12,…
0,±6,±12,…
1,2,3,6
±1,±2,±3,±6
3.
MATH RESPONSE QUESTION
2 mins • 1 pt
5桁の自然数 6945□ が9の倍数であるとき,□に入る数は?
Mathematical Equivalence
ON
Answer explanation
答え:□に入る数は0~9の整数です。5桁の自然数 6945□ が9の倍数であるとき、□に入る数は、6+9+4+5+□が9で割り切れます。(24+□)÷9が割り切れるので□に入る数は3です。
4.
MATH RESPONSE QUESTION
2 mins • 1 pt
6桁の整数 4□1327 が11の倍数であるとき,□にあてはまる数を求めよ。
Mathematical Equivalence
ON
Answer explanation
奇数桁目の和-偶数桁目の和=0,±11,±22,±33,… のように
(奇数桁目の和)と(偶数桁目の和)の差が11の倍数であれば11の倍数なので,
□+3+7-(4+1+2)=□+3
これが11の倍数となるのは,
□=8
5.
MATH RESPONSE QUESTION
2 mins • 1 pt
56を素因数分解しなさい。
Mathematical Equivalence
ON
Answer explanation
56の素因数分解は、56 = 2 × 2 × 2 × 7 です。
6.
MATH RESPONSE QUESTION
2 mins • 1 pt
675を素因数分解しなさい。
Mathematical Equivalence
ON
Answer explanation
675の素因数分解は、675 = 3 × 3 × 3 × 5 × 5 です。
7.
MATH RESPONSE QUESTION
2 mins • 1 pt
756の正の約数の個数を求めよ。
Mathematical Equivalence
ON
Answer explanation
756の約数の個数を求めるには、756を素因数分解してから、素因数の積を求める必要があります。756=2×2×3×3×3×7です。2²の約数の個数は2+1=3個,3³の約数の個数は3+1=4個,7¹の約数の個数は1+1=2個だから3×4×2=24個
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