班级购买活页簿与日记本合计32本,花钱74元.活页簿每本1.9元,日记本每本3.1元.问:买活页簿、日记本各几本?
8795﹣4998+2994﹣3002﹣2008.
98+4×980+59×98.
用简便方法计算 87×2.5+8.7×756.84×10.19.05﹣3.86﹣3.14.
667×668×669﹣666×668×670= .
12.5×3.2×2556.8×0.17+1.7×4.02+0.03×17 9.76﹣2.084+0.24﹣0.9169999×2222+3333×3334.