口算.
1
3
-
1
4
=
42÷10%= 1-0.5= 48×12.5%=
1
9
÷9×
1
9
=
1
4
-
1
5
)×20=
7.2÷0.08=
5
7
-
5
7
÷5=
分析:橫向數(shù):(1)依據(jù)分?jǐn)?shù)減法計(jì)算方法解答,
(2)(4)(5)(8)依據(jù)分?jǐn)?shù)四則運(yùn)算計(jì)算方法解答,
(3)依據(jù)小數(shù)減法計(jì)算方法解答,
(6)運(yùn)用乘法分配律解答,
(7)依據(jù)小數(shù)除法計(jì)算方法解答.
解答:
解:
1
3
-
1
4
=
1
12
,
42÷10%=420, 1-0.5=0.5, 48×12.5%=6,
1
9
÷9×
1
9
=
1
81
,
1
4
-
1
5
)×20=1,
7.2÷0.08=90,
5
7
-
5
7
÷5=6
6
7
點(diǎn)評(píng):本題主要考查學(xué)生運(yùn)用四則運(yùn)算計(jì)算方法,以及正確運(yùn)用簡(jiǎn)便算法解決問題的能力.
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