美美看一本240页的书,已看的页数和全书的页数的比是2:5,还剩多少页没看?6B5],k4I:K5L;U(E6I:W
解:
算式:提示'A2M-F/I0a7_(F3n'O,F2O(z6x,`-{([6B5],k4I:K5L;U(E6I:W
答:还剩3C5h4b,M6\,S/_页没看。6B5],k4I:K5L;U(E6I:W