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b =5 ×10 ^19
a×b = 4×10^23×5×10^19 = 20 ×10 ^42= 2 ×10^ 43
a/b = 4/5 × 10^ 4 = 0,8 × 10^4 = 8 ×10^3
c)a = 3,2 × 10 ^-4
b= 8× 10^-6
a×b = 3,2×8×10^ -10 = 25,6 ×10^-10 = 2,56 ×10^-9
a/b = 3,2 / 8 ×10^2 = 0,4 ×10^2 = 4×10
c)
Mam nadzieję, że pomogłem.