题目内容
计算.
4.67-(2.98+0.67)
73.8×16-73.8×6
(
+
)÷
+
(1-
-
)÷
×[
÷(
+
)].
4.67-(2.98+0.67)
73.8×16-73.8×6
(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
(1-
| 1 |
| 4 |
| 5 |
| 12 |
| 2 |
| 3 |
| 8 |
| 9 |
| 3 |
| 7 |
| 2 |
| 3 |
| 1 |
| 7 |
考点:小数四则混合运算,分数的四则混合运算
专题:运算顺序及法则
分析:①根据加法的交换律和连减的简便方法计算即可;
②根据乘法分配律计算;
③先计算括号里面的,再计算括号外面的除法和加法;
④首先计算括号内的减法,然后计算括号外的除法;
⑤首先计算小括号内的加法,然后计算中括号内的除法,最后计算中括号外的乘法.
②根据乘法分配律计算;
③先计算括号里面的,再计算括号外面的除法和加法;
④首先计算括号内的减法,然后计算括号外的除法;
⑤首先计算小括号内的加法,然后计算中括号内的除法,最后计算中括号外的乘法.
解答:
解:①4.67-(2.98+0.67)
=4.67-2.98-0.67
=4.67-0.67-2.98
=4-2.98
=1.02
②73.8×16-73.8×6
=73.8×(16-6)
=73.8×10
=738
③(
+
)÷
+
=
×
+
=
+
=
④(1-
-
)÷
=(1-
-
)×
=
×
=
⑤
×[
÷(
+
)]
=
×(
÷
)
=
×(
×
)
=
×
=
=4.67-2.98-0.67
=4.67-0.67-2.98
=4-2.98
=1.02
②73.8×16-73.8×6
=73.8×(16-6)
=73.8×10
=738
③(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 14 |
| 20 |
=
| 23 |
| 20 |
④(1-
| 1 |
| 4 |
| 5 |
| 12 |
| 2 |
| 3 |
=(1-
| 3 |
| 12 |
| 5 |
| 12 |
| 3 |
| 2 |
=
| 1 |
| 3 |
| 3 |
| 2 |
=
| 1 |
| 2 |
⑤
| 8 |
| 9 |
| 3 |
| 7 |
| 2 |
| 3 |
| 1 |
| 7 |
=
| 8 |
| 9 |
| 3 |
| 7 |
| 14+3 |
| 21 |
=
| 8 |
| 9 |
| 3 |
| 7 |
| 21 |
| 17 |
=
| 8 |
| 9 |
| 9 |
| 17 |
=
| 8 |
| 17 |
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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