题目内容
(1)4.15-
×
-
(2)26×(5-
)
(3)(
-
)×
(4)17.64-(264%+
)
| 3 |
| 4 |
| 1 |
| 10 |
| 5 |
| 8 |
(2)26×(5-
| 5 |
| 13 |
(3)(
| 4 |
| 5 |
| 2 |
| 5 |
| 1 |
| 2 |
(4)17.64-(264%+
| 1 |
| 5 |
分析:(1)先算乘法,再运用减法的性质简算;
(2)运用乘法分配律简算;
(3)先算括号内的,再算括号外的;
(4)把百分数和分数化为小数,运用加法的性质简算.
(2)运用乘法分配律简算;
(3)先算括号内的,再算括号外的;
(4)把百分数和分数化为小数,运用加法的性质简算.
解答:解:(1)4.15-
×
-
=4.15-
-
=4.15-(
+
)
=4.15-
=4.15-0.7
=3.45;
(2)26×(5-
)
=26×5-
×26
=130-10
=120;
(3)(
-
)×
=
×
=
;
(4)17.64-(264%+
)
=17.64-(2.64+0.2)
=17.64-2.64-0.2
=15-0.2
=14.8.
| 3 |
| 4 |
| 1 |
| 10 |
| 5 |
| 8 |
=4.15-
| 3 |
| 40 |
| 5 |
| 8 |
=4.15-(
| 3 |
| 40 |
| 25 |
| 40 |
=4.15-
| 7 |
| 10 |
=4.15-0.7
=3.45;
(2)26×(5-
| 5 |
| 13 |
=26×5-
| 5 |
| 13 |
=130-10
=120;
(3)(
| 4 |
| 5 |
| 2 |
| 5 |
| 1 |
| 2 |
=
| 2 |
| 5 |
| 1 |
| 2 |
=
| 1 |
| 5 |
(4)17.64-(264%+
| 1 |
| 5 |
=17.64-(2.64+0.2)
=17.64-2.64-0.2
=15-0.2
=14.8.
点评:此题考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律或性质进行简便计算.
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