题目内容
| 7-0.8+8.3-0.2 |
|
(18-
| ||||||||||||||
|
1.25×16×2.5 |
|
分析:(1)我们运用加法的结合律及交换律进行解答即可.
(2)、(3)、(6)四则混合运算的顺序进行计算即可.
(4)运用乘法的分配律进行计算即可.
(5)运用乘法的结合律及交换律,进行解答即可.
(2)、(3)、(6)四则混合运算的顺序进行计算即可.
(4)运用乘法的分配律进行计算即可.
(5)运用乘法的结合律及交换律,进行解答即可.
解答:解:(1)7-0.8+8.3-0.2,
=(7+8.3)-(0.2+0.8),
=15.3-1,
=14.3;
(2)
+
÷
,
=
+
×
,
=
+
,
=1
;
(3)(18-
×21)÷
,
=3×
,
=3
;
(4)
÷7-
×
,
=
×(
-
),
=
×1,
=
;
(5)1.25×16×2.5,
=(1.25×8)×(2.5×2),
=10×5,
=50;
(6)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×
,
=
.
=(7+8.3)-(0.2+0.8),
=15.3-1,
=14.3;
(2)
| 5 |
| 8 |
| 3 |
| 8 |
| 2 |
| 3 |
=
| 5 |
| 8 |
| 3 |
| 8 |
| 3 |
| 2 |
=
| 10 |
| 16 |
| 9 |
| 16 |
=1
| 3 |
| 16 |
(3)(18-
| 5 |
| 7 |
| 9 |
| 10 |
=3×
| 10 |
| 9 |
=3
| 1 |
| 3 |
(4)
| 18 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 1 |
| 7 |
| 18 |
| 13 |
| 5 |
| 13 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
(5)1.25×16×2.5,
=(1.25×8)×(2.5×2),
=10×5,
=50;
(6)
| 3 |
| 5 |
| 7 |
| 9 |
| 1 |
| 3 |
| 3 |
| 2 |
=
| 3 |
| 5 |
| 10 |
| 9 |
| 3 |
| 2 |
=
| 3 |
| 5 |
| 5 |
| 3 |
=
| 3 |
| 5 |
| 3 |
| 5 |
=
| 9 |
| 25 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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