0.48+0.48+0.48+0.48=________×________     
0.75×5=________+________+________+________+________.

0.48    4    0.75    0.75    0.75    0.75    0.75
分析:根據(jù)小數(shù)乘法的意義,求幾個(gè)相同加數(shù)和的簡便運(yùn)算,進(jìn)行解答即可.
解答:0.48+0.48+0.48+0.48=0.48×4     
0.75×5=0.75+0.75+0.75+0.75+0.75.
故答案為:0.48,4,0.75,0.75,0.75,0.75,0.75.
點(diǎn)評(píng):此題考查了小數(shù)乘法的意義及運(yùn)用.
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(2013?福田區(qū)模擬)修一條水渠計(jì)劃每天0.48千米,15天修完,實(shí)際每天多修0.12千米,實(shí)際用了幾天?
分析:(1)算術(shù)方法解數(shù)量關(guān)系:
工作時(shí)間=工作總量÷工作效率
工作時(shí)間=工作總量÷工作效率
;列式
(0.48×15)÷(0.48+0.12)
(0.48×15)÷(0.48+0.12)
;
(2)設(shè)實(shí)際用了X天,根據(jù)
水渠的長度
水渠的長度
相等,列式為
(0.48+0.12)x=0.48×15
(0.48+0.12)x=0.48×15
;
(3)這是一題
比例應(yīng)用題,計(jì)劃每天:實(shí)際每天=
實(shí)際需要
實(shí)際需要
天數(shù):
計(jì)劃需要
計(jì)劃需要
天數(shù),所以列式為
0.48:(0.48+0.12)=x:15
0.48:(0.48+0.12)=x:15
;也可以這樣想:因?yàn)?!--BA-->
工作總量
工作總量
一定,
工作時(shí)間
工作時(shí)間
工作效率
工作效率
比例,計(jì)劃每天是實(shí)際每天的
(  )
(  )
,所以實(shí)際天數(shù)是計(jì)劃天數(shù)的
(  )
(  )
,實(shí)際天數(shù)列式為
0.48
0.48+0.12
=
x
15
0.48
0.48+0.12
=
x
15
,或者說實(shí)際每天是計(jì)劃每天的
(  )
(  )
,所以計(jì)劃天數(shù)是實(shí)際天數(shù)的
(  )
(  )
,列式為
0.48+0.12
0.48
=
15
x
0.48+0.12
0.48
=
15
x

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