6х -х -3 = 4х-х-2-5
5х - 3 = 3х - 7
5х - 3х = -7+ 3
2х = -4
х=-2
Ответ: х = -2
4/3Х +2/3 = 2Х -1
4Х + 2 = 3(2Х-1)
4Х +2 = 6Х -3
4Х -6Х = -3-2
-2Х = -5
2Х = 5
<u>Х = 2,5</u>
1-cos2a+tg2acos2a=sin2a=sin2a/cos2a*cos2a=sin2a+sin2a=2sin2a
1) 6,6*4,1=27,06
2) -2,54+27,06=24,52
Ответ: 24,52