R=l/2pi=9,42/2pi=1,5
s=pir^2=pi*2,25=7,065
T + 1 = 4/9 + 2/9
t + 1 = 6/9
t = 6/9 - 1
t = 6/9 - 9/9
t = - 3/9 = - 1/3
- 1/3 + 1 = 4/9 + 2/9
- 1/3 + 3/3 = 6/9
2/3 = 2/3
Вычслите: а) 7,12+0,57+1,08+5,53 б)16,28+5,395-1,18 в)6,2+7,49+1,8+1,29 г)7,358+8,24-6,458-2,84.
Severina-xx
А) 7,12 + 0,57 + 1,08 + 5,53 = 14,3
б) 16,28+5,395-1,18 = 20,495
в) 6,2 + 7,49 + 1,8 + 1,29 = 16,78
г) 7,358 + 8,24 - 6,458 - 2,84 = 6,3
1) -2x+19=5x-16
-2x-5x=-19-16
-7x=-35
x= -35/-7
x = 5
2)8x-25=3x+20
8x-3x=25+20
5x=45
x=45/5
x=9
3)6-y=3(3-8)
-y= +6-15
-y= -9 /:-1
y=9
4)5(y+1,2)=7y+4
5y+6=7y+4
5y-7y=-6+4
-2y=-2
y=1
Дальше по анологии
5)4(x-3)-16=5(x-5)
4х-12-16=5х-25
4x-28=5x-25
4x-5x=+28-25
-x=3 | :-1
x= -3
6)3x-17=8x+18
7)11-5y= 12-6y
8)4y+(11,8-y)=3,8-5y
9)3x+16=8x-9