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:)
1)x(3x-9)=0 x1=0; 3x-9=0
3x=9
x2=3
2) x(2x+14)=0
x1=0; 2x= -14
x2=-14/2
x2=-7
5 * ( x - 12 ) = 3 * ( x - 4 ) ;
5x - 60 = 3x - 12 ;
5x - 3x = 60 - 12 ;
2x = 48 ;
X = 48 : 2 ;
X = 24