题目内容
计算(能简便要简便)12%
1.25×32×0.25
(2512+5066÷17)×554
(2
-0.5)÷[(1.2+1.55)×
]
+(
-
)÷
.
1.25×32×0.25
(2512+5066÷17)×554
(2
1 |
6 |
20 |
33 |
14 |
15 |
3 |
4 |
2 |
3 |
1 |
5 |
分析:(1)根据乘法结合律和交换律进行计算,
(2)(3)(4)根据四则运算的计算顺序进行计算,
(2)(3)(4)根据四则运算的计算顺序进行计算,
解答:解:(1)1.25×32×0.25,
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;
(2)(2512+5066÷17)×554,
=(2512+298)×554,
=2810×554,
=1556740;
(3)(2
-0.5)÷[(1.2+1.55)×
],
=
÷[2.75×
],
=
÷
,
=1;
(4)
+(
-
)÷
,
=
+
÷
,
=
+
,
=
.
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;
(2)(2512+5066÷17)×554,
=(2512+298)×554,
=2810×554,
=1556740;
(3)(2
1 |
6 |
20 |
33 |
=
5 |
3 |
20 |
33 |
=
5 |
3 |
5 |
3 |
=1;
(4)
14 |
15 |
3 |
4 |
2 |
3 |
1 |
5 |
=
14 |
15 |
1 |
12 |
1 |
5 |
=
14 |
15 |
5 |
12 |
=
27 |
20 |
点评:本题综合考查了学生在四则运算中灵活运用简便算法的能力,注意计算结果的准确性.
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