1.25. oblicz. Wynik zapisz w notacji wykładniczej.
a) 2*10^15*7*10^9 d) 5,2*10^-20*3*10^21
b) 1,44*10^12:1,2*10^5 e) 2,2*10^-5+6*10^-4-8*10^-3
c) 3*10^10+3,5*10^9 f) 1,7*10^-11+5*10^-7*3*10^-5
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a) 2*10^15*7*10^9 = 14 * 10^24 = 1,4 * 10^25
b) 1,44*10^12:1,2*10^5 = (1,44 : 1,2) * (10^5 * 10^12) = 1,2 * 10^17
c) 3*10^10+3,5*10^9 = 10^9(30 + 3,5) = 10^9 * 33,5 = 3,35 * 10^10
d) 5,2*10^-20*3*10^21 = 15,6*10 = 1,56 * 10^2
e) 2,2*10^-5+6*10^-4 - 8*10^-3 = 10^-3 (2,2*10^-2 + 6*10^-1 - 8) = 10^-3 (-8 + 0,6 + 0,022) = 10^-3 (-7,378)
f) 1,7*10^-11+5*10^-7*3*10^-5 = 1,7*10^-11 + 15 * 10^-12 = 1,7*10^-11 + 1,5 * 10^-11 = 3,2 * 10^-11