chứng minh b 75^ 20 =45^10.5^30
ta có : 45^10.5^30=9^10.5^10.5^30=3^20.(5^2)^20=(3.25)^20=75^20
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ta có : 45^10.5^30=9^10.5^10.5^30=3^20.(5^2)^20=(3.25)^20=75^20