方べきの定理②
Authored by 真貴 土井
Mathematics
8th - 12th Grade
Used 8+ times
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5 questions
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1.
FILL IN THE BLANKS QUESTION
2 mins • 2 pts
円 O の半径が 3 のとき，ｘの値を求めよ。
(a)
Answer explanation
x(x+3)=(7-3)×(7+3)
x2+3x-40=0
(x-5)(x+8)=0
x>0 より x=5
2.
FILL IN THE BLANKS QUESTION
2 mins • 2 pts
PA×PB=9 である。
円 O の半径が 5 のとき，OP の値を求めよ。
(a)
Answer explanation
(5-OP)×(5+OP)=9
OP2=16
OP>0 より OP=4
3.
FILL IN THE BLANKS QUESTION
1 min • 2 pts
x の値を求めよ。
(a)
Answer explanation
(x-4)×4=2×3
2x=11
4.
FILL IN THE BLANKS QUESTION
2 mins • 2 pts
x の値を求めよ。
(a)
Answer explanation
(x-3)×(x+3)=2×(2+4)
x2-9=12
x2=21
x>0 より x=√21
5.
FILL IN THE BLANKS QUESTION
1 min • 2 pts
x の値を求めよ。
(a)
Answer explanation
5×(x+5)=10×10
5x=75
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