4)sin5x-sinx=cos3x
2•sin(5x-x)/2*cos(5x+x)/2=cos3x
2•sin2x•cos3x-cos3x=0
cos3x(2sin2x-1)=0
cos3x=0
3x=π/2+πn
x=π/6+πn/3
2sin2x-1=0
sin2x=1/2
2x=(-1)^n*π/6+πn
x=(-1)^2*π/12+πn/2
101) 15*10=150
12*11=132
в)444, в 25 раз
д)72,в50
ж)1640,в250
б)122,в5
г)32,в125
е)222,в50
з)72,в1250
104)3
105)13
106)50/5=10
107)1200/20=60
1) -8.3 + 5.6 = -1(8.3 - 5.6) = -2.7
2) -9.7 +14.3 = 14.3 - 9.7 = 4.6
3) -0.36 + 1.43 = 1.43 - 0.36 = 1.07
4) 0.56 + (-0.89) = 0.56 - 0.89 = -1(0.89 - 0.56) = -0.33
5) -9 + 0.9 = -1(9 - 0.9) = -8.1
6) 6.17 + (-8) = 6.17 - 8 = -1(8 - 6.17) = -1.83
7) 0.78 + (-2) = 0.78 - 2 = -1(2 - 0.78) = -1.22
8) 5 + (-3.65) = 5 - 3.65 = 1.35
9) 14 + (-15.9) = 14 - 15.9 = -1(15.9 - 14) = -1.9