题目内容
怎样简便就怎样算:
4.5+5.5×3.6×0.1;
5-
+
-
;
×0.16×
×0.124×
÷4×
;
10.8×(
+
+
);
(3.25-0.8×
)÷0.1.
4.5+5.5×3.6×0.1;
5-
1 |
3 |
1 |
2 |
1 |
6 |
1 |
4 |
3 |
8 |
1 |
2 |
1 |
2 |
10.8×(
2 |
3 |
5 |
6 |
4 |
9 |
(3.25-0.8×
5 |
8 |
分析:根据四则运算顺序进行计算,能用简便方法计算的用简便方法计算,10.8×(
+
+
)可用乘法分配律计算.
2 |
3 |
5 |
6 |
4 |
9 |
解答:解:(1)4.5+5.5×3.6×0.1,
=4.5+19.8×0.1,
=4.5+1.98,
=6.48;
(2)5-
+
-
,
=4
+
-
,
=5
-
,
=5;
(3)
×0.16×
×0.124×
÷4×
,
=0.04×
×0.124×
÷4×
,
=0.015×0.124×
÷4×
,
=0.00186×
÷4×
,
=0.00093÷4×
,
=0.0002325×
,
=0.00011625;
(4)10.8×(
+
+
),
=10.8×
+10.8×
+10.8×
,
=7.2+9+4.8,
=21;
(5)(3.25-0.8×
)÷0.1,
=(3.25-0.5)÷0.1,
=2.75÷0.1,
=27.5.
=4.5+19.8×0.1,
=4.5+1.98,
=6.48;
(2)5-
1 |
3 |
1 |
2 |
1 |
6 |
=4
2 |
3 |
1 |
2 |
1 |
6 |
=5
1 |
6 |
1 |
6 |
=5;
(3)
1 |
4 |
3 |
8 |
1 |
2 |
1 |
2 |
=0.04×
3 |
8 |
1 |
2 |
1 |
2 |
=0.015×0.124×
1 |
2 |
1 |
2 |
=0.00186×
1 |
2 |
1 |
2 |
=0.00093÷4×
1 |
2 |
=0.0002325×
1 |
2 |
=0.00011625;
(4)10.8×(
2 |
3 |
5 |
6 |
4 |
9 |
=10.8×
2 |
3 |
5 |
6 |
4 |
9 |
=7.2+9+4.8,
=21;
(5)(3.25-0.8×
5 |
8 |
=(3.25-0.5)÷0.1,
=2.75÷0.1,
=27.5.
点评:主要考查学生对于四则运算顺序及乘法分配律的理解.
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