一堆煤，每次运走3吨，运了8次后还剩42吨，运完这堆煤，一共要多少次？2Z'a7Y,Q7^'e7g.S7w*N1j/`.P-Z
算式：提示/b.V'd.W5z/l+@-F:G.O3s4N/K/I9K:e2Z'a7Y,Q7^'e7g.S7w*N1j/`.P-Z
答：一共要.@:C4o9p3e-q.B:h+U)l次。2Z'a7Y,Q7^'e7g.S7w*N1j/`.P-Z