题目内容
计算.
(1)
÷(1.1-
)+
×
(2)99
×91+8×99
+99.75.
(1)
| 2 |
| 15 |
| 3 |
| 4 |
| 1 |
| 3 |
| 4 |
| 7 |
(2)99
| 3 |
| 4 |
| 3 |
| 4 |
分析:(1)按照先算括号里面的减法,再同时计算除法和乘法,最后算加法的顺序解答,
(2)运用乘法分配律解答.
(2)运用乘法分配律解答.
解答:解:(1)
÷(1.1-
)+
×
,
=
÷
+
×
,
=
+
,
=
;
(2)99
×91+8×99
+99.75,
=(91+8+1)×99.75,
=100×99.75,
=9975.
| 2 |
| 15 |
| 3 |
| 4 |
| 1 |
| 3 |
| 4 |
| 7 |
=
| 2 |
| 15 |
| 7 |
| 20 |
| 1 |
| 3 |
| 4 |
| 7 |
=
| 8 |
| 21 |
| 4 |
| 21 |
=
| 4 |
| 7 |
(2)99
| 3 |
| 4 |
| 3 |
| 4 |
=(91+8+1)×99.75,
=100×99.75,
=9975.
点评:(1)依据四则运算顺序正确进行计算,(2)运用乘法分配律解决问题,是本题考查知识点.
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