精英家教网 > 小学数学 > 题目详情
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:横向数:(1)依据分数减法计算方法解答,
(2)(4)(5)(8)依据分数四则运算计算方法解答,
(3)依据小数减法计算方法解答,
(6)运用乘法分配律解答,
(7)依据小数除法计算方法解答.
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
点评:本题主要考查学生运用四则运算计算方法,以及正确运用简便算法解决问题的能力.
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