\(E=1.2.3+2.3.4+3.4.5+...+18.19.20\)

\(4E=1.2.3.4+2.3.4.4+3.4.5.4+...+18.19.20.4\)

\(4E=1.2.3.4+2.3.4.\left(5-1\right)+3.4.5.\left(6-2\right)+...+18.19.20.\left(21-17\right)\)

\(4E=1.2.3.4+2.3.4.5-1.2.3.4+3.4.5.6-2.3.4.5+...+18.19.20.21-17.18.19.20\)

\(4E=18.19.20.21\)

\(4E=143640\)

\(E=\frac{143640}{4}\)

\(E=35910\)

Chúc bạn học tốt ~ 

\(G=2.4.6+4.6.8+6.8.10+...+18.20.22\) ( xem lại đề có nhầm dấu ko nha bn ) 

\(8G=2.4.6.8+4.6.8.8+6.8.10.8+...+18.20.22.8\)

\(8G=2.4.6.8+4.6.8.\left(10-2\right)+6.8.10.\left(12-4\right)+...+18.20.22\left(24-16\right)\)

\(8G=2.4.6.8+4.6.8.10-2.4.6.8+6.8.10.12-4.6.8.10+...+18.20.22.24-16.18.20.22\)

\(8G=18.20.22.24\)

\(8G=190080\)

\(G=\frac{190080}{8}\)

\(G=23760\)

Chúc bạn học tốt ~ 

I study in a very big school. In my city it is the most famous school.. My class room is on the ground floor. My class room is very spacious. It is airy and well ventilated. It has four ceiling fans in it which are sufficient for all the students sitting inside the room.

At a little distance from my classroom is the administrative block. It has spacious verandahs on two sides. It has two doors which ensure cross ventilation. There is also a large window in one of the walls. On both sides, beyond the verandahs, there are small passages and then grassy lawns which also have some flowers growing in flower pots.

My class is very neat and clean.. It has 18 benches for students to sit. Two students can sit together on a bench. I sit with my best friend. Our Bench has a shelf to keep books. It has two doors and three big windows. The walls are white and clean.

In my classroom there are pictures of eminent persons, paintings, charts by students, maps etc. there is a low dais along one wall of the room. On the dais is a table and chair for the teacher. Behind the dais is blackboard for the teacher to write on with a chalk. The students sit facing the blackboard.

289-89.(x-1)=111

89(x-1)=289-111

89(x-1)=178

x-1=178:89

x-1=2

x=3

Ta thấy: \(4^{300}=\left(4^3\right)^{100}=256^{100}\)

\(500^{200}=\left(500^2\right)^{100}=250000^{100}\)

Vì \(256^{100}< 250000^{100}\)nên\(4^{300}< 500^{200}\)

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BTS !! ARMY chuẩn nè 💖💟

16.64.8²:(4³.2⁵.16)

=2⁴.2⁶.2⁶:(2⁶.2⁵.2⁴)

=2⁴.2⁶.2⁶:2¹⁵

=2¹⁶:2¹⁵

=2

minhg cũng trong team 2k7

\(2^{300}=\left(2^3\right)^{100}< \left(3^2\right)^{100}=3^{200}\)

\(9^{20}=3^{40}>3^{39}=27^{13}\)

Trả lời:

a) 3²⁰⁰ và 2³⁰⁰

\(3^{200}=\left(3^2\right)^{100}=9^{100}\)

\(2^{300}=\left(2^3\right)^{100}=8^{100}\)

mà \(9^{100}>8^{100}\)

\(\Rightarrow3^{200}>2^{300}\)

Vậy 3²⁰⁰ > 2³⁰⁰

a)  Số ghi trên can có ý nghĩa là thể tích chất lỏng mà can chứa được.

b)  Phải dùng số can ít nhất là 20/1,5 = 14 chiếc can.

chúc bn hok tốt