Góp một cách khác mặc dù không yêu cầu :">

=>> His father is said to be French

Ta gọi tử là S₁ ta có :

S₁=1+2+2²+2³+...+2²⁰¹⁶

=> 2S₁=2+2²+2³+...+2²⁰¹⁷

=> 2S₁-S₁=(2+2²+2³+....+2²⁰¹⁷)-(1+2+2²+2³+...+2²⁰¹⁶)

=> S₁=2²⁰¹⁷-1

Vậy S=\(\dfrac{2^{2017}-1}{1-2^{2017}}\)

Tick cho mị nhé =)) love :">

information,television,definition, organization,lion, combination,direction,communication,nation,location,addition,education,decision,competition,distribution,population,introduction,association,discussion,inflation,expression,opinion,situation,foundation,passion

Tick cho mị nhé =))) tks

Environmental pollution is a natural disaster that humanity has suffered over time. Carcasses, animal carcasses, scattered everywhere make the clean air disappear instead of foul air. Life is at stake. Today, there are many good and useful programs on the environment: green knight, golden environment, rubbish hand ... and also people react. But the environment has not been thoroughly improved. There are many ways to protect the environment: do not litter indiscriminately, do not paint, graffiti, ... I myself are also trying to do these things. Everyone let's join hands!

đúng nha

Ta có :

(x²+y²)²-(2xy)²= x⁴+2x²y²+y⁴-4x²y²

= x⁴-2x²y²+y⁴= (x²-y²)² = [(x+y)(x-y)]²= (x+y)²(x-y)² (đfcm)

Vậy (x²+y²)²-(2xy)²= (x+y)²(x-y)²

^{Chúc bạn học tốt}

1

1 got

2 comes

mình nghĩ vậy

dear A,
I'll have a party at 2:pm on 21th May . It'll be celerbrated in my house.
I'll fell happy when you come. Some my friends have been invited, too. I think you'll fun when you meet my friénd. Because they're lovely. Come here you can taste some special food which my mother will cook. In the party I'll make a tiny game, You'll like it. After the party we'll come to the beach.
please let me know if you 'll come

your friend

theo mình nghĩ là C