题目内容
(2011?长汀县模拟)
用递等式计算,能简算的要简算. 1485+290÷58 |
0.125×32×0.25 | 1080-63.58-36.42 | ||||||||||||
(
|
168.1÷(4.3×2-0.4) | (
|
分析:(1)1485+290÷58,根据整数四则混合运算的运算顺序,先算除法再算加法;
(2)0.125×32×0.25,把32分解为8×4,再运用乘法交换律进行简算;
(3)1080-63.58-36.42,根据减法的运算性质进行简算;
(4)(
+
)×24,运用乘法分配律进行简算;
(5)168.1÷(4.3×2-0.4),根据小数四则混合运算的运算顺序,按照小数四则运算的法则进行计算;
(6)(
+
)÷(
-
),根据分数四则混合运算的运算顺序,按照分数四则运算的法则进行简算;
(2)0.125×32×0.25,把32分解为8×4,再运用乘法交换律进行简算;
(3)1080-63.58-36.42,根据减法的运算性质进行简算;
(4)(
1 |
3 |
1 |
4 |
(5)168.1÷(4.3×2-0.4),根据小数四则混合运算的运算顺序,按照小数四则运算的法则进行计算;
(6)(
5 |
8 |
1 |
4 |
2 |
3 |
1 |
2 |
解答:解:(1)1485+290÷58,
=1485+5,
=1490;
(2)0.125×32×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(3)1080-63.58-36.42,
=1080-(63.58+36.42),
=1080-100,
=980;
(4)(
+
)×24,
=
×24+
×24,
=8+6,
=14;
(5)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(6)(
+
)÷(
-
),
=
÷
,
=
×6,
=
,
=5
.
=1485+5,
=1490;
(2)0.125×32×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(3)1080-63.58-36.42,
=1080-(63.58+36.42),
=1080-100,
=980;
(4)(
1 |
3 |
1 |
4 |
=
1 |
3 |
1 |
4 |
=8+6,
=14;
(5)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(6)(
5 |
8 |
1 |
4 |
2 |
3 |
1 |
2 |
=
7 |
8 |
1 |
6 |
=
7 |
8 |
=
21 |
4 |
=5
1 |
4 |
点评:此题主要考查整数、小数、分数四则混合运算,注意运算顺序和计算法则,灵活运用所学的运算定律、运算性质进行简便计算.
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