（3/4）×82%-75×0.82=0.75×0.82-75×0.82=-74.25×0.82 我感觉题有点不对,这是几年级的题呀,怎么出现负数了?嗯，题出错了。75后面加个%就可以做了（3/4）×82%-75%×0.82=0.75×0.82-0.75×0.82=0