解﹙﹣0.75﹚的五次方×﹙﹣8/9﹚³÷﹙﹣0.625﹚
=﹙﹣3/4﹚的五次方×﹙﹣8/9﹚³÷﹙﹣5/8﹚
=-3^5/4^5×【-8^3/9^3】×（-8/5)
=-3^5/4^5×【2^9/3^6】×（8/5)
=-3^5*2^9*8/2^10*3^6*5
=-8/3*2*5
=-4/15