详细解答如下：
原式等于0.75÷0.25×7.3=3×7.3=21.9~回答完毕~~结果仅供参考~~\(^o^)/~祝学习进步~~~
0.75x7.3÷0.25=0.75÷0.25x7.3=3x7.3=21.9
