chứng minh a 12^8.9^12=8^16
b 75^ 20 =45^10.5^30
chứng minh a 12^8.9^12=8^16 b 75^ 20 =45^10.5^30
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chứng minh a 12^8.9^12=8^16
b 75^ 20 =45^10.5^30