(B4x3^9j1|5t;E-]'n
(1)一共有多少个?2x(g0t.H(b2B1D:?6j (B4x3^9j1|5t;E-]'n
(2)把左边第2个拿走后还剩几个?1R2X1J+f0[2N3J4N (B4x3^9j1|5t;E-]'n