2х - в одной
х - во второй
2х-10 - в третьей
2х+34=х+2х-10
х=44 - во второй
2*44=88 - в первой
88-10=78 - в третьей
.........................................
<span>найдите область определения функции y=log0,75 (16-6x-x^2)
</span>16-6x-x^2>0 ⇔x²+6x-16<0 x²+6x-16=0 ⇔x1=-8 x2=2
<span> + - +
-------------------(-8)///////////////////////////(2)-----------------
</span>область определения функции y=log0,75 (16-6x-x^2) - <span> x</span>∈(-8; 2)<span>
</span>
(22167-8+36713+40941*7+26278*6):55903 = <span>9</span><span>
1. 40941 * 7 = 286587
2. </span>26278 * 6 = <span>157668
3. </span>22167 - 8 = <span>22159
4. </span> 22159 + 36713 = <span>58872
5. </span> 58872 + 286587 = <span>345459
6. </span>345459 + 157668 = <span>503127
7. </span>503127 : 55903 = 9
А)
1/2 : 1/3 = 1/2 * 3/1 =(1*3)/(2*1) = 3/2 = 1 1/2
проверка:
1 1/2 * 1/3 = 3/2 * 1/3 = 1/2
б)
1/2 : 1/4 = 1/2 * 4/1 =(1*4)/(2*1) = 4/2 = 2
проверка:
2 * 1/4 = 2/4 = 1/2
в)
1/8 : 1/4 = 1/8 * 4/1 = 4/8 = 1/2
проверка:
1/2 * 1/4 = 1/8
г)
1/4 : 4/5 = 1/4 * 5/4 = 5/16
проверка:
5/16 * 4/5 = 4/16 = 1/4
д)
8/9 : 4/21 = 8/9 * 21/4 =(8*21)/(9*4)=(2*7)/(3*1) = 14/3 = 4 2/3
проверка:
4 2/3 * 4/21 = 14/3 * 4/21 = (14*4)/(3*21)= (2 *4)/(3*3) = 8/9
е)
16/25 : 24/35 = 16/25 * 35/24 = (16*35)/(25*24)= (2*7)/(5*3) = 14/15
проверка:
14/15 * 24/35 = (14*24)/(15*35) = (2*8)/(5*5) = 16/25
ж)
52/81 : 26/27 = 52/81 * 27/26 = (52*27)/(81*26) = (2*1)/(3*1)=2/3
проверка:
2/3 * 26/27 = (2*26)/(3*27) = 52/81
з)
100/123 : 75/82 = 100/123 * 82/75 = (100*82)/(123*75)= (4*2)/(3*3)= 8/9
проверка:
8/9 * 75/82 = (8*75)/(9*82) = (4*25)/(3*41) = 100/123