2a+2b=26 см
ab=42 см2
a+b=13
a=13-b
(13-b)*b=42
13b-bв квадрате=42
-bв квадрате+13b-42=0
D=169-4*(-42)* (-1)=1
b=-13+1/(-2)=6
b=-13-1/(-2)=7
Ответ: 6 и 7 см.
1 1/12 * 3 2/3 - (2 5/6 + 3 5/6 * 7/23)*3/5 = 13/12 x 11/3 - (17/6 + 23/6 x 7/23)*3/5 =
(13 * 11)/(12 * 3) - [17/6 + (23 * 7)/(6 * 23)]*3/5 = 143/36 - (17/6 + 161/138)*3/5 =
143/36 - (17*23 + 161)/138*3/5 = 143/36 - (391+161)/238 * 3/5 = 143/36 - 552/238 * 3/5 =
143/36 - 552*3/238*5 = 143/36 -1656/1190 =143/36 - 828/595 = (143*595 - 828*36)/21420 =
(85085 -29808)/21420 = 55277/21420 = 2 12437/21420 = 2,58
128+160+192=480 сумма всех чилел
1)22962:534=43
2)9936:48=207
3)43+207=250
4)250:25=10
5)10+37=47
6)47*43=2021
<span>f(x)=cos3x*cosx+sin3x*sinx-9=0
Изи
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