题目内容
怎样算简便就怎样算
(1)
|
(2)0.6×
| ||||||||||||||||
(3)45
|
(4)19÷(
| ||||||||||||||||
(5)(
|
(6)(0.75-
|
分析:(1)(2)(3)运用乘法分配律解答,
(4)(5)(6)依据四则混合运算的运算顺序进行计算: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.
(4)(5)(6)依据四则混合运算的运算顺序进行计算: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.
解答:解:(1)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)0.6×
+60%×
+
×
,
=(
+
+
)×0.6,
=1×0.6,
=0.6;
(3)45
÷9,
=(45+
)×
,
=45×
+
×
,
=5+
,
=5
;
(4)19÷(
+
),
=19÷
,
=12;
(5)(
-
)÷
+
,
=
÷
+
,
=
+
,
=
;
(6)(0.75-
)×(
+
),
=
×
,
=
.
| 4 |
| 15 |
| 7 |
| 9 |
| 11 |
| 15 |
| 7 |
| 9 |
=(
| 4 |
| 15 |
| 11 |
| 15 |
| 7 |
| 9 |
=1×
| 7 |
| 9 |
=
| 7 |
| 9 |
(2)0.6×
| 13 |
| 25 |
| 8 |
| 25 |
| 3 |
| 5 |
| 4 |
| 25 |
=(
| 13 |
| 25 |
| 8 |
| 25 |
| 4 |
| 25 |
=1×0.6,
=0.6;
(3)45
| 45 |
| 57 |
=(45+
| 45 |
| 57 |
| 1 |
| 9 |
=45×
| 1 |
| 9 |
| 45 |
| 57 |
| 1 |
| 9 |
=5+
| 5 |
| 57 |
=5
| 5 |
| 57 |
(4)19÷(
| 3 |
| 4 |
| 5 |
| 6 |
=19÷
| 19 |
| 12 |
=12;
(5)(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 6 |
=
| 2 |
| 3 |
(6)(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
点评:本题主要考查学生对四则混合运算顺序的掌握情况,以及正确运用乘法分配律解决问题的能力.
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