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 

Where is the unit Summer Clouds ?

I will listen to you

Everyone must to listen to Summer Clouds  

Ok?

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

I left:

130 - 100 = 30 ( apples )

Answer: 30 apples

I don't very good at English

But I will study English much

Too can do some hard questions