题目内容
计算,能简算的要简算.
(1)45×(
+
) (2)
÷(
+
)×
(3)101×
(4)(
-
)÷
(5)
×
+
×
(6)
+
÷12.
(1)45×(
| 5 |
| 9 |
| 4 |
| 15 |
| 4 |
| 9 |
| 7 |
| 9 |
| 4 |
| 9 |
| 3 |
| 4 |
| 99 |
| 100 |
(4)(
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 42 |
| 4 |
| 9 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 9 |
| 1 |
| 12 |
| 1 |
| 5 |
分析:(1)(3)(4)(5)运用乘法分配律解答,
(2)(6)依据分数四则运算计算方法:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序即可解答,
(2)(6)依据分数四则运算计算方法:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序即可解答,
解答:解:(1)45×(
+
),
=45×
+45×
,
=25+12,
=37;
(2)
÷(
+
)×
,
=
÷
×
,
=
×
,
=
;
(3)101×
,
=100×
+1×
,
=99+
,
=99
;
(4)(
-
)÷
,
=
×42-
×42,
=7-6,
=1;
(5)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(6)
+
÷12,
=
+
,
=
.
| 5 |
| 9 |
| 4 |
| 15 |
=45×
| 5 |
| 9 |
| 4 |
| 15 |
=25+12,
=37;
(2)
| 4 |
| 9 |
| 7 |
| 9 |
| 4 |
| 9 |
| 3 |
| 4 |
=
| 4 |
| 9 |
| 11 |
| 9 |
| 3 |
| 4 |
=
| 4 |
| 11 |
| 3 |
| 4 |
=
| 3 |
| 11 |
(3)101×
| 99 |
| 100 |
=100×
| 99 |
| 100 |
| 99 |
| 100 |
=99+
| 99 |
| 100 |
=99
| 99 |
| 100 |
(4)(
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 42 |
=
| 1 |
| 6 |
| 1 |
| 7 |
=7-6,
=1;
(5)
| 4 |
| 9 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 9 |
=
| 2 |
| 3 |
| 4 |
| 9 |
| 5 |
| 9 |
=
| 2 |
| 3 |
=
| 2 |
| 3 |
(6)
| 1 |
| 12 |
| 1 |
| 5 |
=
| 1 |
| 12 |
| 1 |
| 60 |
=
| 1 |
| 10 |
点评:(1)依据四则运算顺序正确进行计算,(2)正确运用乘法分配律解决问题,是本题考查知识点.
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