A few times of 27 equals nine RT

A few times of 27 equals nine RT

27^(2/3)=9

() * 27 equals 9.18

(0.4) * 27 equals 9.18

How much is √ 27 - √ 3 / 2

Why can't I work it out

What is 8-2 * 3?

It's two

Indonesia earthquake, tsunami is retribution

39 degrees 41 minutes 36 seconds multiplied by 5 131 degrees 23 minutes 36 seconds divided by 6

39°41′36″×5
=195°205′180″
=195°208′
=198°28′
131°23′36″÷6
=21°53′36″

36 or 36 cents

The same size

86 degrees 23 minutes 12 seconds minus 67 degrees 36 minutes 50 seconds,

86 degrees 23 minutes 12 seconds = 85 degrees 82 minutes 72 seconds
So it's easy to reduce
It's 18 degrees, 46 minutes, 22 seconds

According to the regulations, if you don't make a phone call, you have to pay a monthly rental of 12 yuan. If you make a phone call for one minute, you have to pay a monthly rental of 12 yuan
Pay 0.18 yuan. How many minutes did Xiao Ming's family call this month?
There should be a brief explanation. If you speak well, I will offer a reward

I made a local call for X minutes,
It can be seen from the title
Local telephone fee = monthly rent + call fee = monthly rent + call time * unit price
be
50.52=12+x*0.18
The solution is x = 214

If the sum of the first seven terms of an arithmetic sequence is 48 and the sum of the first 14 terms is 72, then the sum of the first 21 terms of an arithmetic sequence is 48
sn,s2n-sn,s3n-s2n,…… Is an arithmetic sequence
It can be used in any arithmetic sequence?

S7=48
S14=72
S14-S7=a8+a9+…… +a14
a8-a1=7d
a9-a2=7d
……
a14-a7=7d
Add
(a8+…… +a14)-(a1+…… +a7)=49d
That is, (s14-s7) - S7 = 49D
S21-S14=a15+…… +a21
A15-a8 = 7d
……
a21-a14=7d
So (A15 +...) +a21)-(a8+…… +a14)=49d
(S21-S14)-(S14-S7)=49
(S21-S14)-(S14-S7)=(S14-S7)-S7
S7, s14-s7, s21-s14, etc
(S21-S14)-(S14-S7)=(S14-S7)-S7
(S21-72)-(72-48)=(72-48)-48
S21=72