(a^2 - 36)(a^2 + 36) - (a^4 - 36a^2 + 324) =
= a^4 - 1296 - a^4 + 36a^2 - 324 =
= 36a^2 - 1620 =
= 36(a^2 - 45)
36* (1/36 - 45) = 1 - 45*36 = - 1619
1. 1-5х² при х=-4
1 - 5•(-4)² = 1 - 5•16 = 1-80=-79
2. а^10•а^15=а^(10+15) = а^25 а^16:а^11=а^(16-11)=а^5
(а^7)³=а^(3•7)=а²¹
(3х)^5=3^5•х^5=15х^5
а а⁴ а⁴
(——)⁴ = — = —
5 5⁴ 625
(10^15•10^7)/10^19 = 10^22/10^19 = 10^(19-22) = 10^-3
7^8/(7•7^5)=7^8/7^6=7^2
(13²-12²)²+(6²+7⁴)^0 = (13²)²-2•13²•12²+(12²)²+1= 13⁴-2•156²+12⁴+1=
10^6х=1000
х=-3
10^(6-3)=10^3=1000
(25²•5^5)/5^7 = 25²/5² = 2
шестую задачу не видно:)
C^2-0,49=c^2-49/100=(c-7/10)(c+7/10)