а)(2,4 * 10^3) + (1.6 * 10^3)=2400+1600=4000
б)(2.4 * 10^3) - (0.4 * 10^3)=2400-400=2000
в)(4.2 * 10^3) * (2 * 10^2)=4200*200=840000
г)(4.2 * 10^3) : (2.1 * 10^2)=4200:210=20
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а)(2,4 * 10^3) + (1.6 * 10^3)=2400+1600=4000
б)(2.4 * 10^3) - (0.4 * 10^3)=2400-400=2000
в)(4.2 * 10^3) * (2 * 10^2)=4200*200=840000
г)(4.2 * 10^3) : (2.1 * 10^2)=4200:210=20