X=tg(arccos(-1/4)+π/2) = - ctg(arccos(-1/4) =
= - [cos(arccos(-1/4)]/[√(1-cos²(arccos(-1/4))]=
= - (-1/4)/√(1-(-1/4)²) = (1/4)/(√15/4) = 1/√15 = √15/15
x=√15/15
6дм7см+3дм8см=67см+38см=105см
√147*√128 147*128 18816
__________ = √ __________ (вся дробь под одним корнем) = √ _____ =
√24 24 24
= √784 = 28
<span>7,2х - 5,4х = 1,8x
1,8 x + 0,46=1
1,8x = 1 -0,46
1,8x= 0,54
x=0,54/1,8
x=0,3
</span>
7/40=175/1000=0,175
11/400=275/10000=0,0275
21/168=7/56=1/8=125/1000=0,125
35/280=5/40=1/8=125/1000=0,125
47/376=1/8=0,125