一本故事书193页,如果笑笑每天看25页,8天能看完吗?
简便运算. 578﹣298 3.64÷4+4.36×25% 23.5+99×23.5.
21×42+21×63﹣21×5= .
(7.88+6.77+5.66)×(9.31+10.98+10)﹣(7.88+6.77+5.66+10)×(9.31+10.98)= .
10×+17×75%﹣7×0.75.
14﹣(12﹣18)= .