题目内容
(2013?安图县)
| 选择合适的方法计算. 1.25×25×4×8 |
44×1.6-0.16×40 | ||||||||||||
| 8.5-(5.6+4.8)÷1.3 |
| ||||||||||||
165×
|
(
|
分析:(1)根据乘法交换律和结合律进行计算;
(2)根据乘法分配律进行计算;
(3)先算加法,再算除法,最后算减法;
(4)先算减法,再根据乘法结合律进行计算;
(5)根据乘法分配律进行计算;
(6)先算加法,再算除法,最后算加法.
(2)根据乘法分配律进行计算;
(3)先算加法,再算除法,最后算减法;
(4)先算减法,再根据乘法结合律进行计算;
(5)根据乘法分配律进行计算;
(6)先算加法,再算除法,最后算加法.
解答:解:
(1)1.25×25×4×8,
=(1.25×8)×(25×4),
=10×100,
=1000;
(2)44×1.6-0.16×40,
=44×1.6-1.6×4,
=(44-4)×1.6,
=40×1.6,
=64;
(3)8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
(4)
×(
-
)÷
,
=
×
÷
,
=
×(
÷
),
=
×1,
=
;
(5)165×
+165×
,
=165×(
+
),
=165×1,
=165;
(6)(
+
)÷
+
,
=
÷
+
,
=
+
,
=
.
(1)1.25×25×4×8,
=(1.25×8)×(25×4),
=10×100,
=1000;
(2)44×1.6-0.16×40,
=44×1.6-1.6×4,
=(44-4)×1.6,
=40×1.6,
=64;
(3)8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
(4)
| 3 |
| 7 |
| 4 |
| 5 |
| 2 |
| 3 |
| 2 |
| 15 |
=
| 3 |
| 7 |
| 2 |
| 15 |
| 2 |
| 15 |
=
| 3 |
| 7 |
| 2 |
| 15 |
| 2 |
| 15 |
=
| 3 |
| 7 |
=
| 3 |
| 7 |
(5)165×
| 4 |
| 7 |
| 3 |
| 7 |
=165×(
| 4 |
| 7 |
| 3 |
| 7 |
=165×1,
=165;
(6)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
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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