The volume of the figure is: \(\left[\left(8.4\right):2\right].10=160\left(cm^3\right)\)

= \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+...+\dfrac{1}{5.6}\)

= \(\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{5}-\dfrac{1}{6}\)

= \(\dfrac{1}{1}-\dfrac{1}{6}=\dfrac{5}{6}\)

Divisible by 5 and 39 <=> Divisible by 5,3 and 13.

Because it is divisible by 5 => y = 0 or 5.

If y = 0 then replace: 2 + 3 + x + 8 + 0 \(⋮3\) <=> 13 + x \(⋮3\)

We have x = 2;5;8 satisfy but only x = \(\varnothing\) satisfy divisible by 13.

If y = 5 then replace: 2 + 3 + x + 8 + 5 \(⋮3\) <=> 18 + x \(⋮3\)

We have x = 0;3;6;9 satisfy but x = 9 satisfy divisible by 13

So x = 9 and y = 5 to satisfy divisible by 5 and 39 \(\left(23985⋮5and39\right)\)

= \(\left(2^2\right)^{17}.5^{24}.9^{65}\)

= \(4^{17}.5^{24}.9^{65}=...4\cdot...5\cdot...9=...0\)

So the last digit of the power is: 0

The numbers divisible by 2 is: \(1234;678;3452\)

= \(\dfrac{3}{2}\left(\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+...+\dfrac{1}{59}-\dfrac{1}{61}\right)\)

= \(\dfrac{3}{2}\left(\dfrac{1}{5}-\dfrac{1}{61}\right)=\dfrac{3}{2}.\dfrac{56}{305}=\dfrac{84}{305}\)

\(3\dfrac{4}{5}=\dfrac{3.5+4}{5}=\dfrac{19}{5}\)

So \(3\dfrac{4}{5}\)is written in impropal fraction as \(\dfrac{19}{5}\)

To cut a log of wood into six pieces, Ben must cut 5 times => 1 time he cut: \(30:5=6\left(minutes\right)\)

To cut a log of wood into nine pieces, Ben must cut 8 times => The time he cut is: \(6.8=48\left(minutes\right)\)

My answer is D: 48 minutes.

The answer A and C are wrong.

The number of cabin at the bottom of the wheel is: 14 + 32 = 46.

My answer is D. Because if he look at the behind then everything must change (the opposite).

The matches she need to build the triangle is: 6.3 = 18 (matches)

So the number of matches in each side of the square is: (38-18):4 = 5 (matches)

So the answer is: 5 matches

We see: 1 + 1 + 1 = 3 and 2 + 3 + 4 = 9\

=> The star is 0. Their sum is: 0+0+0=0 (A) - Help you solve math miss the sum.

The smallest 5-digit number is: \(10000\).

The largest 4-digit number is: 9999.

So there differance is: 10000 - 9999 = 1

Sorry, the last row is: \(\dfrac{50}{309}.\dfrac{1}{4}=\dfrac{25}{618}\)

A=\(\dfrac{1}{6}-\dfrac{1}{10}+\dfrac{1}{10}-\dfrac{1}{14}+...+\dfrac{1}{202}-\dfrac{1}{206}=\dfrac{1}{6}-\dfrac{1}{206}=\dfrac{50}{309}\)

We have:

Six kids: 20 cookies altogether. Andrew + Betty + Carl = 1 + 2 + 3 = 6

=> The three other kids eat: 20 - 6 = 14 (cookies)

=> The biggest number cookies the other two kids eat (not include Daniella) is (14-1):2=6,5 is 6 cookies.

=> The smallest possible number of cookies is: 14 - (6.2) = 2 (cookies)

ANSWER: 2 cookies.

So 

1,5 cats eat 1,5 mouse in 1,5 hours

=> 15 cats eat 15 mouse in 1,5 hours

=> 15 cats eat 150 mouse in 15 hours.

So the answer is: 150 mouse.

\(B=2017^{2016}.2016^{2017}=2017^{4.504}.2016^{2017}=...1...6=...6\)

First, are you six? If you think this is a discussion, then you go back to grade 1 to study. You have so many 6-year-old question and copy other member's question. So ASK PROPRELY.

Second, "Find the number" not "Compact".

Third, don't A4 (Auto Ask Auto Answer)

P/s: If i can speak Vietnamese, I would.

@WhySoSerious is probably right.