Пошаговое объяснение:
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-tv01.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-tv02.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-tv03.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-tv04.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-jp01.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-jp02.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-jp03.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-jp04.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-es01.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-es02.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-es03.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-es04.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-It01.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-It02.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-It03.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-It04.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-fr01.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-fr02.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-fr03.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-fr04.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-gr01.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-gr02.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-gr03.html
http://www.borealoutdoor.com/bmc/video-poi-v-mcg-gr04.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-tv01.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-tv02.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-tv03.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-tv04.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-jp01.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-jp02.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-jp03.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-jp04.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-es01.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-es02.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-es03.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-es04.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-It01.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-It02.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-It03.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-It04.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-fr01.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-fr02.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-fr03.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-fr04.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-gr01.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-gr02.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-gr03.html
https://theshedcafe.com.au/uox/video-poi-v-mcg-gr04.html
x dx 1 2x dx 1 d(7+x²) 1
∫ = ∫ = ∫ = ln(7+x²)+C
7+x² 2 7+x² 2 7+x² 2
[1/2 *ln(7+x²)+C ]¹= 1/2*[ 2x /(7+x²)+0]= x /(7+x²)
x+18 (x-2)+20 1 2(x-2) dx
2) ∫dx=∫ dx= ∫ dx+20 ∫ =
x²-4x-12 (x-2)²-16 2 (x-2)²-16 (x-2)²-16
1 1 | x-2-4 | 1 5 | x-6 |
= *ln|(x-2)²-16|+20 * *ln || +C= *ln |x²-4x-12|+*ln || +C
2 2*8 | x-2+4 | 2 4 | x+2 |
3) ∫(3-x) cosx dx=[ u=3-x , du=-dx , dv=cosx dx , v=sinx ] =(3-x)sinx+∫ sinx dx=
=(3-x)sinx-cosx+C
[(3-x)sinx-cosx]¹= -sinx+(3-x)cosx+sinx +0=(3-x)cosx
Пошаговое объяснение:
Доказательство для 1-4 класса.
12 и 100 четные числа .
Если складывать четное количество нечетных чисел, то в сумме получит четное число.
Если складывать нечетное количество нечетных чисел , то в сумме всегда будет нечетное число.
Значит если сложить 3 нечетных числа или 5 нечетных чисел , то сумма получится также нечетная.
Пусть наши 3 нечетных числа будут 5,7,9 , сложим их
5+7+9=21 - нечетное
Путь наши 5 нечетных чисел будут
1,3,5,7,9
1+3+5+7+9=25