学年

質問の種類

数学 高校生

高校生数学円と直線です。 下の赤線で印つけてる部分なんですが、計算しても答えにならないというか、計算できません、、、。 どなたか途中式も含めて解説お願いします🙇

原の数順 ※ F オ lit "IT イ ( ← →①, とすると, ③は2つの (2)③が直線を表すときのんは? (3) ③ 解答 ときは? (SS-) E (1)円 ①,② の半径は順に5, 2 である。(SS)( 2つの円の中心 (0, 0, 1, 2) 間の距離をdとすると d=√12+2°=√5から |√5-2 <d<√5 +2 も よって,2円 ① ② は異なる2点で交わる。e="-g)+ (2) k(x²+ y²−5)+(x−1)²+(y−2)²−4=0 (k (±) ...... (3) inf. -k とすると,③は2つの円①,② の交点を通る図形を表す。 ことはできない これが直線となるのは k=-1 のときであるから,③③がx.yo k=-1 を代入すると (x2+y2-5) +(x-1)+(y-2)2-4=0 整理すると x+2y-3=0 ② 半径2 (2) (3) la x なるように、 定める。 if (2) の直線の ①の円の方 立させて解くと きで る場 解 (1) 01 (3)③点 (03) を通るとして, ③ に x=0,y=3 を代入して整理 円の交点 すなわ ① k=1 ①と②の 円 1 半径5 められる。 すると 4k-2=0 よって k=2 共 (02+32-5) これを③に代入して整理すると(x-2/3) 3+ (11/28) 2 = 02/09 +{(-1)^+1- 3 9 よって 中心 ( 11 ) 半径 129 " 3 3 3 PRACTICE 94° 2つの円x2+y2=10,x2+y²-2x+6y+2=0 の2つの交点の座標を求めよ。 2つの交点と原点を通る円の中心と半径を求めよ。

解決済み 回答数: 1
英語 高校生

教えてほしいです

2 次の英文を読み, 空所に入れるのに最も適切なものを,それぞれ下の①~④のうちから一つずつ選びなさい。 (6) When growing tomatoes, we know we should pick them when they're bright red. With carrots, however, ( 6 ) because they grow underground. ①we should pick them when they turn orange (2) it's hard to know when they're ready (3) we should grow them more carefully than tomatoes (4) it's easy to know when they're bright red (7) Although it is quick, easy and convenient to be able to look up information on the internet, it can sometimes be difficult ( 7 ) because there is so much information. to find what you are looking for (2) to improve the convenience of the internet (3) to get more than what you need that people often experie (4) to have good computer literacy (8) Would you be happier if you were richer? Many people believe that they would be. But research conducted over many years suggests that ( 8 ). People in the United States, for example, are, on average, richer than New Zealanders, but they are not happier. poorer people tend to worry about their financial problems 2 pleasure in life usually comes from great wealth (3) the best way to be happy is learning how to save money greater wealth doesn't generally imply greater happiness (9) Many European rivers were once heavily polluted by manufacturing industries. As a result, wild animals dependent on clean water disappeared. However, as stricter environmental standards took effect, rivers such as the Thames of London have become much cleaner. Consequently, ( 9 ). water quality has continued to decline wild animals avoid drinking from the Thames (3) wild animals are making a comeback in many rivers (4) wild animals no longer depend on clean water

回答募集中 回答数: 0