2.
49x17-416
=833-416
=417
42-56÷8
=42-7
=35
(476+136)÷9
=612÷9
=68
3.
(1)(25+8)×2=66(棵)
(2)(160-24)÷4=34(页)
(3)48×5+48=288(袋)
4.
下午比上午多运来35-28=7(车),
每车重84÷7=12(吨),
上午运来12×28=336(吨),
下午运来12×35=420(吨)。
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