094598010151050132012101265148513751430154015951650180013201380144015001560162016801740哪些积是笔算得到的?怎样笔算呢?哪些积是口算的,是怎样口算的?×55057560062565067570072575077080584087591094598010151050990660103599066010351350130512601215117011251080132012101265148513751430154015951650600480580540520500460440560600600480580540520500460440560900900660690720750780810840870660120012008809209608801000104010801120116015001500110011501200125013001350140014501800180013201380144015001560162016801740【练练笔】22×22=59×48=(1)先求一共有多少棵橘子树?4×8=32(棵)(2)再求一共收获多少千克橘子?32×25=800(千克)列综合算式4×8×25=32×25=800(千克)答:今年东东家一共收获橘子800千克。解:2、冬冬家有4行橘子树,每行8棵,今年平均每棵收获橘子25千克。(1)今年冬冬家一共收获橘子多少千克?(2)把这些橘子装箱,每箱8千克。用5辆三轮车运走,平均每车运多少箱?说说解决上面这些问题的步骤,每步各做了些什么?解:(2)800÷8÷5=100÷5=20(箱)答:用5辆三轮车运走,平均每车运20箱。或800÷5÷8=160÷8=20(箱)课堂小结说一说:通过这节课的整理复习,你有哪些收获?练习十三第5题、第6题。课后作业
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