一条跑道需要重新整修,已经修了40米,还剩50米,这条跑道长多少米?:D*{4Y6~
算式:提示1Q3T1[9Z1u-?:L/q.c'i*a)y;v,J*R5~:M2d:D*{4Y6~
答:这条跑道长'n*c.I7n+H0b*y4?1{)I少米。:D*{4Y6~