4. Efectuați: a)7^3×7^5:7^2 b) (5^4) ^6:(5^7)^3 c)(3^3)^2×(3^5)^2:[(3^2)3]^4
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Răspuns:
a)28•40:21=28•2=56
b)25^6:40^3=150:120=1,25
c)12^2•20^2:(9^3)^4=24•40:32^4=960:128=7,5