脱式计算.0.25×1.25×4×82.125×14+1.875÷4(2.5-0.125)×0.8+6.242÷23-23÷22.25×4.8+77.5×0.4836×(29+712)-数学

题文

脱式计算.
0.25×1.25×4×8
2.125×
1
4
+1.875÷4
(2.5-0.125)×0.8+6.24
2
3
-
2
3
÷2
2.25×4.8+77.5×0.4836×(
2
9
+
7
12
题型:解答题  难度:中档

答案

(1)0.25×1.25×4×8,
=(0.25×4)×(1.25×8),
=1×10,
=10;
(2)2.125×
1
4
+1.875÷4,
=(2.125+1.875)×
1
4

=4×
1
4

=1;
(3)(2.5-0.125)×0.8+6.24,
=2.5×0.8-0.125×0.8+6.24,
=2-0.1+6.24,
=8.14,
(4)2÷
2
3
-
2
3
÷2,
=2×
3
2
-
2
3
×
1
2

=3-
1
3

=2
2
3

(5)2.25×4.8+77.5×0.48,
=(22.5+77.5)×0.48,
=100×0.48,
=48;
(6)36×(
2
9
+
7
12
),
=36×
2
9
+36×
7
12

=8+21,
=29.

据专家权威分析,试题“脱式计算.0.25×1.25×4×82.125×14+1.875÷4(2.5-0.125)×0.8..”主要考查你对  运算定律和简便算法  等考点的理解。关于这些考点的“档案”如下:

运算定律和简便算法

考点名称:运算定律和简便算法

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