(60*140 50*140)*2 60*50相对y=√(1-sin4x)相对f(x) f(x 1)=8x 7m^3-m^2 m/m-1
a^x a^y = a^x [1 a^(y-x)] return countTable[v]
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a^y = a^x [1 a^(y-x)] return countTable[v]
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