考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算,分?jǐn)?shù)的簡便計(jì)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)把5÷8寫成
,再根據(jù)乘法分配律解答即可.
(2)根據(jù)乘法分配律進(jìn)行計(jì)算.
(3)(4)先根據(jù)乘法分配律把括號展開,再根據(jù)乘法結(jié)合律進(jìn)行計(jì)算.
(5)根據(jù)四則混合運(yùn)算的順序進(jìn)行計(jì)算.
(6)把37
化為帶分?jǐn)?shù),再根據(jù)分?jǐn)?shù)除法的計(jì)算方法進(jìn)行計(jì)算即可.
解答:
解:
13.75×+1.25×0.625+5÷8 =13.75×+1.25×+ =×(13.75+1.25+1) =×16 =10 (2)36×(++) =36×+36×+36× =12+9+6 =27
(3)(+)×34×26 =×34×26+×34×26 =26×8+10×34 =208+340 =548
(4)(+)×12+1 =×12+×12+1 =5+(+1) =5+2 =7
(5)÷[(+)×] =÷[(+)×] =÷[×] =×20 =4
(6)37÷36 =× = =1 |
點(diǎn)評:整數(shù)的運(yùn)算定律同樣適用與分?jǐn)?shù),根據(jù)數(shù)據(jù)的特點(diǎn)靈活的進(jìn)行計(jì)算.