基础强化第1题答案
①360÷4÷9
=90÷9
=10
②720÷8÷3
=90÷3
=30
③630÷7÷3
=90÷3
=30
④360÷(4×9)
=360÷36
=10
⑤720÷﹙8×3﹚
=720÷24
=30
⑥630÷﹙7×3﹚
=630÷21
=30
基础强化第2题答案
①360÷8÷5
=360﹙8×5﹚
=360÷40
=9
②560÷﹙7×4﹚
=560÷7÷4
=80÷4
=20
③420÷14
=420÷7÷2
=30
拓展应用第3题答案
解:210÷5÷7=6(星期)
答:一共需要6星期