1)а)16*(5/2+9/16)=16*(20/16+9/16)=16*26/16=16/1*26/16=26
б)(1,7+3,8):2,2=5,5:2,2=2,5
2)а)2x-14x2/7x+3=2x(7x+3)/7x+3-14x2/7x+3=14x2+6x/7x+3-14x2/7x+3=6x/7x+3
б)6x+30/x+8:x2-25/2x+16=6(x+5)/x+8:(x-5)(x+5)/2(x+8)=6/1:x-5/2=6/1*2/x-5=12/x-5
3)а)2в -3+6в-1=1/8+1/6=6/48+8/48=14/48=7/24
б)7в-8*7в-9/7в-16=7в-17/7в-16=7в-1=1/7
4)а)4x+8/x+2-x-4/x+2=0
3x+4/x+2=0
(3x+4)(x+2)/x+2=0
3x+4=0
3x=-4
x=-4/3=-1 1/3
б)2-3(2x+2)=5-4x
2-6x+6=5-4x
-6x+4x=-2-6+5
-2x=-3
X=3/2=1 1/2
44cos2a = 44(cos²a - sin² a) = 44(1 - sin²a - sin²a) = 44(1 - 2sin²a) = 44 - 88sin²a = 44 - 88*(-0,3)² = 44 - 88*0,09 = 44 - 7,92 = 36,08
3^5*3^6 / 3^4*3^2=3^5*3^6 / 3^6=3^5. Ответ: 3^5.