题目内容
计算下面各题.(能简算的要用简便方法算)
60×(
+
-
)
1-[
+(
-
)]
×
+
÷
.
60×(
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
1-[
| 1 |
| 6 |
| 3 |
| 4 |
| 7 |
| 12 |
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 10 |
| 11 |
分析:(1)运用乘法分配律简算;
(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)把除法变为乘法,再通过数字转化,运用乘法分配律简算.
(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)把除法变为乘法,再通过数字转化,运用乘法分配律简算.
解答:解:(1)60×(
+
-
)
=60×
+60×
-60×
=24+45-30
=39
(2)1-[
+(
-
)]
=1-[
+
]
=1-
=
(3)
×
+
÷
=
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
=60×
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
=24+45-30
=39
(2)1-[
| 1 |
| 6 |
| 3 |
| 4 |
| 7 |
| 12 |
=1-[
| 1 |
| 6 |
| 1 |
| 6 |
=1-
| 1 |
| 3 |
=
| 2 |
| 3 |
(3)
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 10 |
| 11 |
=
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 11 |
| 10 |
=
| 11 |
| 8 |
| 5 |
| 10 |
| 11 |
| 8 |
| 3 |
| 10 |
=
| 11 |
| 8 |
| 5 |
| 10 |
| 3 |
| 10 |
=
| 11 |
| 8 |
| 8 |
| 10 |
=
| 11 |
| 10 |
点评:此题是考查四则混合运算,注意运算顺序以及灵活运用一些定律进行简便计算.
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