1.
A= 2.8^4.27^2+4.9^9/2^7.6^7+2^7.40.9^4
B= (2/3)^3 . (-3/4)^2.(-1)^5/(22/5)^2.(-5/12)^3
2. Tìm số tự nhiên x, biết:
a, 4^x+4^x+3= 4160
b, 2^x-1+5.2^x-2=7/32
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