二一班有学生58人,每两个人用一张桌子,需要多少张桌子?教室里已有15张桌子,还差多少张桌子?;P*G'K6A0c
算式:提示(H4h(b+Q-h,d;l/M8B3i;P*G'K6A0c
答:需要/g3A8s6h8B6](l4T张桌子,还差8c0O0X(k5T(z1A8t(N5g3k:V5}(u/w张桌子。;P*G'K6A0c