The definite integral of the product of integrable functions is equal to the product of their respective definite integrals A right B wrong

The definite integral of the product of integrable functions is equal to the product of their respective definite integrals A right B wrong

B

How many numbers between 1 and 200 that are neither perfect squares nor perfect cubes?

14's Square & lt; 200 & lt; 15's Square, 5's Cube & lt; 200 & lt; 6's cube, then there are 14 + 5 = 19 numbers (that is, complete square or cubic numbers) that do not meet the condition of the title, so there are 200-19 = 181 questions

Ask for the key phrases and sentences of the eighth grade volume I English (people's Education Press)
How often does hard ever happen? What's the best movie theater

too…… To be too old to be able to
It's adj for sb to do sth Of
add…… to mix up pour into …… Look at the textbook
help sb (to)dosth
Two types of questions
@***Key points: the + comparative level, the + comparative level, the more The more
He is a senior
Of the two is the comparative level, and in is the superlative level, such as Lingming is the tallest in my class
These are easy to test, others can read notebooks and big newspapers

There are 160 red, yellow and white balls. If you take out 13 red balls, 14 yellow balls and 15 white balls, there are 120 left. If you take out 15 red balls, 14 yellow balls and 13 white balls, there are 116 left. How many red, yellow and white balls are there?

According to the above analysis, taking 160 △ 40 = 4 times just finished, red ball is still poor: 43-1 = 13, white ball is more than 1-45 = 15, yellow ball is finished; it shows that 13 of red ball is equal to 15 of white ball, the ratio of red ball to white ball is 3:5; according to the comparison of two schemes, it is found that 13-15 = 215 of white ball is more than 215 of red ball by 4; that is, white ball is more than red ball by 4 △ 215 = 30, so red ball has 30 △ 215（ 5-3) × 3 = 45; white ball has 45 + 30 = 75; yellow ball is 160-45-75 = 40; answer: (1) original yellow ball 40, (2) original red ball 45, white ball 75

Seven kilometers and 90 meters are equal to several meters

7090m
(analysis: 7 km = 7000 m, so 7 km 90 m = 7090 m)

Primary school mathematics problem over 200 return 300, discount number is equal to

200 ÷ (200 + 300) = 0.4 = 40% = 40% discount
The discount is equal to 40%

Five out of six minus a fraction, four out of nine plus the same fraction, they get the same number. What's the fraction?

Let this fraction be X
Five sixths - x = four ninths + X
-X-x = 4 / 9 - 5 / 6
-2X = - 7 / 18
X = 7 / 36
7 out of 36
I hope I can help you
Come on~

How many tons of water is one cubic meter of water?

1 ton

linear equation in two unknowns
A school arranges dormitories for junior boarding students. If there are 5 students in each room, there are 4 students who cannot be arranged. If there are 6 students in each room, there is only 4 students in one room, and there are 2 empty rooms. Find the number of boarding students and dormitories in this grade

There are x boarding students and Y dormitories
5y=x-4
6(y-3)+4=x
The solution is x = 94, y = 18

Formula (- 17 / 4) - (+ 25 / 8) + (- 39 / 8) - (- 11 / 2) detailed solution,

(-17/4)-(+25/8)+(-39/8)-(-11/2)
=-34/8-25/8-39/8+44/8
=10/8-64/8
=-54/8
=-27/4