已知5^x=2,5^y=3,求5^3x+2y的值
问题描述:
已知5^x=2,5^y=3,求5^3x+2y的值
答
5^(3x+2y)=5^(x+x+x+y+y)=2*2*2*3*3=72
答
解
5^x=2
5^y=3
5^(3x+2y)
=5^3x×5^2y
=(5^x)³×(5^y)²
=8×9
=72