证明:\( \left(\frac{a^{x+1}}{a^{y+1}}\right)^{x+y}\left(\frac{a^{y+2}}{a^{z+2}}\right)^{y+z}\left(\frac{a^{z+3}}{a^{x+3}}\right)^{z+x}=1 \)
待做:
我们需要证明 \( \left(\frac{a^{x+1}}{a^{y+1}}\right)^{x+y}\left(\frac{a^{y+2}}{a^{z+2}}\right)^{y+z}\left(\frac{a^{z+3}}{a^{x+3}}\right)^{z+x}=1 \).
解答
我们知道,
$(a^{m})^{n}=a^{m n}$
$a^{m} \times a^{n}=a^{m+n}$
$a^{m} \div a^{n}=a^{m-n}$
$a^{0}=1$
因此,
左边 $=(\frac{a^{x+1}}{a^{y+1}})^{x+y}(\frac{a^{y+2}}{a^{z+2}})^{y+z}(\frac{a^{z+3}}{a^{x+3}})^{z+x}$
$=(a^{x+1-y-1})^{x+y} \times(a^{y+2-z-2})^{y+z}(a^{z+3-x-3})^{z+x}$
$=(a^{x-y})^{x+y} \times(a^{y-z})^{y+z} \times(a^{z-x})^{z+x}$
$=a^{(x-y)(x+y)} \times a^{(y-z)(y+z)} \times d^{(z-x)(z+x)}$
$=a^{x^{2}-y^{2}} \times a^{y^{2}-z^{2}} \times a^{z^{2}-x^{2}}$
$=a^{x^{2}-y^{2}+y^{2}-z^{2}+z^{2}-x^{2}}$
$=a^{0}$
$=1$
$=$ 右边
证毕。
广告