4 1/2 + 3 1/5 = 9/2 + 16/5 =(9 × 5 16 × 2)/10 = 45/10 + 32/10 = 77/10 = 7 7/10
77/10 ÷ 113 = 77/10 × 1/113 = 77/1130
ответ 77/1130
<span>(0,018+0,982)/(8*0,5-0,8)=0,3125
0,018+0,982=1
8*0,5=4
4-0,8=3,2
1/3,2=0,3125
</span><span>
</span>
5 ^ ( Х - 1 ) < 1/25
5 ^ ( Х - 1 ) > 5 ^ 2
Х - 1 > 2
Х > 3
( 3 ; + бесконечность)
Cos(90-15)cos15= sin15cos15= ¹/₂ * 2sin15cos15= ¹/₂ sin(2*15)=
=¹/₂ sin30=¹/₂ * ¹/₂= 1/4
-4cos26/cos154=-4cos26/cos(180-26)=-4cos26/-cos26=4