橡皮:每盒10块,进货价:每盒44元,零售价:每块6元;
水性笔:每盒8支,进货价:每盒16元,零售价:每支2.5元;
一天共卖出橡皮25块、水性笔20支,这一天橡皮和水性笔共盈利多少元?
+ = 1- = 1.25× = - =
0.9+99×0.9= 0÷ = 1÷ = -0.5=
0.6×101= 3.2×2.5×12.5=
①4:5=x:25
②1+4x=6.7
③3x﹣60%x=4.32
④:3