题目内容
(2008?红安县)4.05-2.86-0.14
75×60%+24×
+0.6
1375+450÷18×25
120÷[(
+
)×
]
(
-
)÷
×
8÷[(
-
)×
].
75×60%+24×
| 3 |
| 5 |
1375+450÷18×25
120÷[(
| 11 |
| 6 |
| 2 |
| 3 |
| 3 |
| 10 |
(
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 2 |
| 15 |
| 7 |
8÷[(
| 8 |
| 5 |
| 2 |
| 3 |
| 2 |
| 7 |
分析:(1)4.05-2.86-0.14利用a-b-c=a-(b+c)进行计算,
(2)75×60%+24×
+0.6利用乘法分配律进行计算,
(3、(6)可按运算顺序计算,
(4)120÷[(
+
)×
]利用乘法分配律进行计算,
(5)(
-
)÷
×
利用乘法分配律进行计算.
(2)75×60%+24×
| 3 |
| 5 |
(3、(6)可按运算顺序计算,
(4)120÷[(
| 11 |
| 6 |
| 2 |
| 3 |
| 3 |
| 10 |
(5)(
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 2 |
| 15 |
| 7 |
解答:解:(1)4.05-2.86-0.14
=4.05-(2.86+0.14),
=4.05-3,
=1.05;
(2)75×60%+24×
+0.6
=75×0.6+24×0.6+0.6,
=(75+24+1)×0.6,
=100×0.6,
=60;
(3)1375+450÷18×25
=1375+25×25,
=1375+625,
=2000;
(4)120÷[(
+
)×
]
=120÷[
×
+
×
],
=120÷[
+
],
=120×
,
=160;
(5)(
-
)÷
×
=(
-
)×
×
,
=
×
×
-
×
×
,
=
-
,
=
;
(6)8÷[(
-
)×
]
=8÷[
×
],
=8×
,
=30.
=4.05-(2.86+0.14),
=4.05-3,
=1.05;
(2)75×60%+24×
| 3 |
| 5 |
=75×0.6+24×0.6+0.6,
=(75+24+1)×0.6,
=100×0.6,
=60;
(3)1375+450÷18×25
=1375+25×25,
=1375+625,
=2000;
(4)120÷[(
| 11 |
| 6 |
| 2 |
| 3 |
| 3 |
| 10 |
=120÷[
| 11 |
| 6 |
| 3 |
| 10 |
| 2 |
| 3 |
| 3 |
| 10 |
=120÷[
| 11 |
| 20 |
| 4 |
| 20 |
=120×
| 4 |
| 3 |
=160;
(5)(
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 2 |
| 15 |
| 7 |
=(
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 3 |
| 15 |
| 7 |
=
| 3 |
| 5 |
| 2 |
| 3 |
| 15 |
| 7 |
| 1 |
| 4 |
| 2 |
| 3 |
| 15 |
| 7 |
=
| 6 |
| 7 |
| 10 |
| 28 |
=
| 1 |
| 2 |
(6)8÷[(
| 8 |
| 5 |
| 2 |
| 3 |
| 2 |
| 7 |
=8÷[
| 14 |
| 15 |
| 2 |
| 7 |
=8×
| 15 |
| 4 |
=30.
点评:考查学生在四则运算中合理运用简便计算的能力.
练习册系列答案
相关题目