(2/3)的x次方乘(9/8)的x次方=27/64 求x的值
问题描述:
(2/3)的x次方乘(9/8)的x次方=27/64 求x的值
答
(2/3)^x=2^x/3^x,同理(9/8)^x=9^x/8^x=3^(2x)/2^(3x)。(2/3)的x次方乘(9/8)的x次方=2的x次方乘以3的2x次方除以(3的x次方乘以2的3x次方),化简的3的x次方除以2的2x次方,即3/4的x次方,它等于27/64,所以x=3
答
(2/3×9/8)的x次方=27/64
(3/4)的x次方=(3/4)³
∴ x=3