Cho tam giác ABC vuông ở B, kéo dài AC về phía C một đoạn CD=AB=1, góc CBD=30 độ. Tính AC.
Cho tam giác ABC vuông ở B, kéo dài AC về phía C một đoạn CD=AB=1, góc CBD=30 o . Tính AC. Giải: Lấy điểm E trên BD sao cho AB//CE ð ⃤ ABC ~ ⃤ CED ð ð CE.AD=CD.AB=1.1=1 Gọi x=AC Tac có: (pitago) Tam giác BCE vuông tại C (vì góc B bằng góc C so le) => Thay vào biểu thức trên(màu đỏ), ta được: =>(x 2 -1)(x+1) 2 =3 ó (x 2 -1)(x 2 +2x+1)=3 ó x 4 +2x 3 +x 2 -x 2 -2x-1=3 ó x 4 +2x 3 -2x-4=0 ó x 3 (x+2)-2(x+2)=0 ó (x+2)(x 3 -2)=0 ó x 3 -2=0 (x+2>0 vì x là số dương) =>
“It really comes down to the question of, ‘Isn’t $10 million enough?’ Like, when does it stop?” she asked. “At what point is it amoral that we’re building Jeff Bezos a helipad when we have the most amount of homeless people in New York City?”
ReplyDeleteFirst of all, 'freedom' means you don't get a say in how much someone else gets to have if they work for it. Second of all...no, it is not amoral that Jeff Bezos gets a helipad, because 'we' aren't building it for him. HE is, with the money he EARNED. He didn't bust into a bank and steal that money. He didn't even steal it from all the people who bought things on Amazon. He got it by giving something to people that they wanted enough to give his company money, and he earned the money by doing that better than the competitors. It would, however, be EVIL to steal his money just because you are envious and have not been able to produce similar results with YOUR labor. Sorry; pouring drinks just doesn't earn as much money as building and running a successful company.
And the homeless? Well, a good deal of that is due to mental illness. NONE of it is because of 'rich people' having 'too much money'. There isn't a single person in America who is homeless because some rich guy somewhere made more than 10 million dollars.
The "Green New Deal" Is none of those.
ReplyDeleteIt's not green. It's a Communist Manifesto intended to bankrupt and enslave America.
It's not new. It's the same lie that the Commies have been selling for a century.
It's not a deal. It's a power grab intended to take over the energy industry, just like they are trying to do to the health care and insurance industries with "Medicare for All."
Brought to you by the same people who said the "Affordable Care Act" was affordable.