77⁷ = 1,604852327 . 10¹³

100% correct

There are 4 days in the Sunday

Tomorrow is April 30th. Yesterday was April 28th 

Last week it was 5th on Sunday

A = 2 + 2² + 2³ + 2⁴ + 2⁵ + 2⁶ + 2⁷ + 2⁸ + 2⁹ + 2¹⁰

A = 2 + 4 + 8 + 16 + 32 + 64 + 128 + 256 + 512 + 1024

Then you calculated

The average of 10 + 10 + 10 is 10

Because \(\dfrac{10+10+10}{3}\)= \(\dfrac{30}{3}=10\)

Too easy

10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90 + 100

= ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + ( 50 + 100 )

= 100 + 100 + 100 + 100 + 150

= 100 x 4 + 150

= 400 + 150

= 550

0,6(x + 10 ) + 0,4(11x - 5 ) = 0,7x + 25,5

0,6 . x + 0,6 x 10 + 0,4.11 - 42= 0,7x + 25,5

( 0,6x + 4,4x ) - 0,7x = 25,5 - 4

5x - 0,7x = 21,5

4,3x = 21,5

=> x = 21,5 : 4,3 = 5

M = \(\dfrac{5}{7}.\dfrac{5}{11}+\dfrac{5}{7}.\dfrac{2}{11}-\dfrac{5}{7}.\dfrac{14}{11}\)

M = \(\dfrac{5}{7}.\left(\dfrac{5}{11}+\dfrac{2}{11}-\dfrac{14}{11}\right)\)

M = \(\dfrac{5}{7}.\dfrac{-7}{11}\)

M = \(\dfrac{-5}{11}\)

50 + 70 + 90 + 30 + 10

= ( 70 + 30 ) + ( 90 + 10 ) + 50

= 100 + 100 + 50

= 200 + 50

= 250

The area of the triagle ABC is:

( 5 x 3 ) : 2 = 7,5 ( ....² )

Answer: 7,5 ....² 

I will listen to you

The number is 12

Mà bn viết hơi dài dòng

Mình đọc ko hiểu lắm

phanhuytien you're wrong

Because 80 + 30 = 110 not 130

You must to careful

60 + 20 + 80 + 30 + 50 + 10

= ( 20 + 80 ) + ( 30 + 10 + 60 ) + 50

= 100 + 100 + 50

= 200 + 50

= 250

I don't know this question

Because i don't very good at English

Sorry so much.

We have: 10 = 2 . 5, 20 = 2² . 5, 40 = 2³ . 5

=> ƯCLN ( 10;20;40 ) = 2 . 5 = 10

Too easy

1*2*3*........*100 = .........0

=> The last digit of this product is 0

This is a easy question

20 + 80 + 40 + 50 + 20 + 60

= ( 20 + 80 ) + ( 40 + 60 ) + ( 50 + 20 )

= 100 + 100 + 70

= 200 + 70

= 270

50 + 300 + 50 + 100

= ( 50 + 50 ) + ( 300 + 100 )

= 100 + 400

= 500

Expressiveness ( tính nhanh ):

50 + 300 + 50 + 100

I left:

130 - 100 = 30 ( apples )

Answer: 30 apples

I have 130 apples. I give my friend Hung 100 apples. Ask how many apples I left?

I don't very good at English

But I will study English much

Too can do some hard questions

8² + 5² + 15²

= 64 + 25 + 225

= 64 + ( 25 + 225 )

= 64 + 250

= 314

8² + 5² + 15² 

18.3 + 25.3 + 3.7

= 54 + 75 + 21

= 129 + 21

= 150

Please anyone me

I want  to have a lot of points

Everyone can me?

A = \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+........+\dfrac{1}{34.35}\)

A = 1 - \(\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+..........+\dfrac{1}{34}-\dfrac{1}{35}\)

=> A = 1 - \(\dfrac{1}{35}\)= \(\dfrac{35}{35}-\dfrac{1}{35}=\dfrac{34}{5}\)

So, A = \(\dfrac{34}{5}\)