题目内容
(2010?广西)灵活计算下面各题
(1)25×0.36×4
(2)36÷[(
-
)×4]
(3)
+
+
+
(4)18×
-3÷
.
(1)25×0.36×4
(2)36÷[(
5 |
6 |
1 |
3 |
(3)
1 |
8 |
5 |
9 |
7 |
8 |
4 |
9 |
(4)18×
2 |
3 |
3 |
2 |
分析:(1)运用乘法交换律与结合律简算;
(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)运用加法交换律与结合律简算;
(4)先算乘法和除法,再算减法.
(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)运用加法交换律与结合律简算;
(4)先算乘法和除法,再算减法.
解答:解:(1)25×0.36×4,
=25×4×0.36,
=100×0.36,
=36;
(2)36÷[(
-
)×4],
=36÷[
×4],
=36÷2,
=18;
(3)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(4)18×
-3÷
,
=12-3×
,
=12-2,
=10.
=25×4×0.36,
=100×0.36,
=36;
(2)36÷[(
5 |
6 |
1 |
3 |
=36÷[
1 |
2 |
=36÷2,
=18;
(3)
1 |
8 |
5 |
9 |
7 |
8 |
4 |
9 |
=(
1 |
8 |
7 |
8 |
5 |
9 |
4 |
9 |
=1+1,
=2;
(4)18×
2 |
3 |
3 |
2 |
=12-3×
2 |
3 |
=12-2,
=10.
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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