四年级数学上册《运算律》简便运算计算题
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简介
类型一:(注意:一定要括号外的数分别乘括号里的两个数，再把积相加). (40+8)X25 125X(8+80) 36X(100+50) =40X25+8X25 =125X8+125X80 =36X100+36X50 =1000+200 =1000+10000 =3600+1800 =1200 =11000 =5400 类型二:(注意:两个积中相同的因数只能写一次) 36X34+36X66 75X23+25X23 63X43+57X63 =36X(34+66) =23X(75+25) =63X(43+57) =36X100 =23X100 =63X100 =3600 =2300 =6300 类型三:(提示:把102看作100+2;81看作80+1,再用乘法分配律) 78X102 69X102 56X101 =78X(100+2) =69X(100+2) =56X(100+1) =78X100+78X2 =69X100+69X2 =56X100+56X1 =7800+156 =6900+138 =5600+56 =7956 =7038 =5656
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