1) log(√7)(1/7)+3^log₃7=log(7^(1/2)7⁻¹+7=-2log₇7+7=-2+7=5.
2) √(25^(1/log⁶5)+49^(1/log₈7))=√(5^2log₅6+7^2log₇8)=
=√(5^log₅6²+7^log₇8²)=√(6²+8²)=√100=10.
3) 10^(1-lg5)=10*10^(-lg5)=10/10^lg5=10/5=2.
4) log(c)(16c²)=log(c)4⁴+log(c)c²=4log(c)2+2=4*(-3)+2=-10.
Ответь:
5. 3
sin180+7cos180-8tg360+ctg45=3*0+7*(-1)-8*0+1=-6
6.
-6x*4y*(-27)=648ху
-2,5a*0,04c=-0,1ас
5xz*3yz=15zyz^2
3a +5 -(2a+6) +4a=3a+5-2a-6=a-1
-3*(2m+n) +(7m-n)=-6m-3n+7m-n=m-4n
4x-(5x-(1-x))=4x-(5x-1+x)=4x-(6x-1) =4x-6x+1=1-2x
(x - 9)^2 - (x - 3)^2 = 0
( x - 9 - (x - 3)) * ( x - 9 + x - 3) = 0
- 6 * ( 2x - 12) = 0
2x - 12 = 0
x - 6 = 0
x = 6