体育室有足球和篮球共45个，篮球比足球多7个，足球有多少个？2d2N0?4f'g/s1F
算式：提示:y)F2c8X2d2N0?4f'g/s1F
答：足球有8W)},N'X-y;P:M7|/\9\6b个。2d2N0?4f'g/s1F