A)-5x=-10
x=2
б)-8y+25=0
8y=25
y=0,32
в) -t+3=0
-t=-3
t=3
г)4a-a=3
3a=3
a=1
1)0,04^(-2) - 0,008^(-1) + 0,08^(-2)-0,2^(-4)=
= 1/0,04^(2) - 1/0.008 + 1/0.08^(2) - 1/0.2^(4)=
= 1/0.016 - 125 + 1/0.0064 - 1/0.0016 = -125 + 156.25=31.25
2)3,6*10^6
------------- * 5*10^4 = 3.6 * 10^6 / (9*10^8) * 5*10^4 =
(3*10^4)^2
= 18*10^10 / (9*10^8) = 2*10^2=200
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