5(y^2-4y+4) 3 (y^2+y+1) (y-2)^2
__________ × ___________ = ______×
(y-1)×(y^2+y+1) 5 (2y-4) y-1
3 3 (y-2) 3y-6
______ = _______= _____
2 (y-2) 2 (y-1) 2y-2
1) 15/16 : 3/8 = 15/16 * 8/3 = 5/2
2) 5/2 * 3/4 = 15/8 = 1 7/8
Ctq(arcsin1 -arcctq2)-?---
arcsin1 =π/2 ; arcctq2 =α .
ctqα =2 ⇒tqα =1/ctqα =1/2.
ctq(arcsin1 -arcctq2) =ctq(π/2 -α) =tqα ||по формуле приведения ||
=tq(arcctq2) =tq(arctq(1/2)) =1/2.
㏒₂х+㏒₄х=3
㏒₂х+㏒₂²х=3
㏒₂х+1/2㏒₂х=3
㏒₂х*(1+ 1/2)=3
1,5㏒₂х =3
㏒₂х =3/1,5
㏒₂х =2
х=2² =4
По 12 чисел на 5 ,на 6, на 7,на8 и на 9.
12*5=60 способов