精英家教网 > 小学数学 > 题目详情
(1)969696×999999÷323232÷333333=
(2)416×221÷17×34÷208=
(3)99000÷25÷4=
(4)40÷
1
25
×25
=
(5)(31÷
92
93
)×(8÷1
1
92
)
=
(6)1÷(2÷3)÷(3÷4)÷(4
?
5)÷(5÷6)
=
(7)125×5.6=
(8)12.5×
1
7
×0.56
=
分析:(1)(2)调整运算顺序,使计算简便;
(3)运用除法的性质简算;
(4)把除法改为乘法,再计算;
(5)把除法改为乘法,用倒数约分;
(6)运用除法的性质简算;
(7)把5.6拆成8×0.7,运用乘法分配律简算;
(8)把0.56拆成8×0.07,运用乘法发交换律与结合率简算.
解答:解:(1)969696×999999÷323232÷333333,
=(969696÷323232)×(999999÷333333),
=3×3,
=9;

(2)416×221÷17×34÷208,
=(416÷208)×211×(34÷17),
=2×211×2,
=844;

(3)99000÷25÷4,
=99000÷(25×4),
=99000÷100,
=990;

(4)40÷
1
25
×25,
=40×25×25,
=1000×25,
=25000;

(5)(31÷
92
93
)×(8÷1
1
92
),
=31×
93
92
×8×
92
93

=248;

(6)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6),
=1÷2×(3÷3)×(4÷4)×(5÷5)×6,
=l÷2×6,
=3;
(7)125×5.6,
=125×(8×0.7),
=125×8×0.7,
=1000×0.7,
=700;

 (8)12.5×
1
7
×0.56,
=12.5×
1
7
×(8×0.07),
=(12.5×8)×(
1
7
×0.07),
=100×0.01,
=1.
点评:仔细观察,根据数字特点,运用运算定律或运算技巧,灵活解答.
练习册系列答案
相关习题

科目:小学数学 来源: 题型:解答题

(1)969696×999999÷323232÷333333=
(2)416×221÷17×34÷208=
(3)99000÷25÷4=
(4)数学公式=
(5)数学公式=
(6)数学公式=
(7)125×5.6=
(8)数学公式=

查看答案和解析>>

同步练习册答案