题目内容
(2010?徐闻县)
计算下列各题,能简算的要简算 (1)(
|
(2)5.28-(2.56+0.44)+1.72 | (3)
| ||||||||||||||
(4)25×12.5×32 | (5)(5-4.75)÷(2×2.5-3) | (6)27÷7+43×(1-
|
分析:算式(1)、(3)运用乘法的分配律进行计算,这样计算会更加简便.
算式(2)、(5)、(6)运用分数,小数的四则混合运算的顺序进行计算,有括号的先计算括号内部的,最后计算括号外面的.
算式(4)运用乘法的结合律及交换律进行计算,是计算更加简便.
算式(2)、(5)、(6)运用分数,小数的四则混合运算的顺序进行计算,有括号的先计算括号内部的,最后计算括号外面的.
算式(4)运用乘法的结合律及交换律进行计算,是计算更加简便.
解答:(1)(
+
+
)×36,
=
×36+
×36+
×36,
=12+6+4,
=22;
(2)5.28-(2.56+0.44)+1.72,
=5.28+1.72-3,
=7-3,
=4;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)25×12.5×32,
=24×4×12.5×8,
=100×100,
=10000;
(5)(5-4.75)÷(2×2.5-3),
=0.25÷2,
=0.125,
(6)27÷7+43×(1-
),
=
+
,
=
,
=10;
1 |
3 |
1 |
6 |
1 |
9 |
=
1 |
3 |
1 |
6 |
1 |
9 |
=12+6+4,
=22;
(2)5.28-(2.56+0.44)+1.72,
=5.28+1.72-3,
=7-3,
=4;
(3)
4 |
7 |
5 |
9 |
3 |
7 |
5 |
9 |
=(
4 |
7 |
3 |
7 |
5 |
9 |
=1×
5 |
9 |
=
5 |
9 |
(4)25×12.5×32,
=24×4×12.5×8,
=100×100,
=10000;
(5)(5-4.75)÷(2×2.5-3),
=0.25÷2,
=0.125,
(6)27÷7+43×(1-
6 |
7 |
=
27 |
7 |
43 |
7 |
=
27+43 |
7 |
=10;
点评:完成本题要注意分析式中数据,运用合适的简便方法计算
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