Math 公式 Flashcards

1
Q

√2, √3, √5, π

A

1.414, 1.732, 2.236, 3.141

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2
Q

13^2, 14^2, 15^2

A

169, 196, 225

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3
Q

a^0

A

1

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4
Q

解の公式

ax^2+bx+c=0

A

x=( -b ± √( b^2 - 4ac)) / 2a

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5
Q

・3で割り切れる数
・8で割り切れる数
・9で割り切れる数

A

・各桁の和が3の倍数
・下3桁が割り切れる
・各桁の和が9の倍数

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6
Q

素数で覚えること

A

・1は含まない

・100以下の整数は、2,3,5,7で割り切れなければ素数

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7
Q

約数の個数

A=a^x+b^y+c^z

A

(x+1)(y+1)(z+1)個

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