Дано:
Rc=Rm/3
Tm=60Tc
найти:
Vm/Vc
V=2пи*R/T
Vm=2пи*Rm/Tm=2пи*Rm/60Tc
Vc=2пи*Rc/Tc=2пи*Rc/3Tc
Vm/Vc=2пи*Rm*3Tc/60Tc*2пи*Rm=3/60=1/20
№1104.
1) -3 < 1+2x < 4 | (-1)
-4 < 2x < 3 | :2
-2 < x < 1,5
(-2 ; 1.5)
2) 1 ⩽ 3-x ⩽ 5 | (-3)
-2 ⩽ -x ⩽ 2 | *(-1)
2 ⩾ x ⩾ -2
[2 ; -2]
3) -7 < 2x-5 ⩽ 1 | +5
-2 < 2x ⩽ 6 | :2
-1 < x ⩽ 3
(-1 ; 3]
7x+11
x = - 11/7
Вроде так.
(8×1+150)-6×1=158-6=152
(8×12+150)-6×12=246-72=174
1)4*(3+2у)+6=2*(3+2у)
12+8у+6=6+4у
8у-4у=6-6-12
4у=-12
у=-12/4
У=-3
2)0.21*(х+4)= -0.03(х+60)
0.21х+0.84=-0.03х-1.8
0.21х+0.03х=-1.8-0.84
0.24х=-2.64
х=-2.64/0.24
Х=-11