题目内容
脱式计算
①10÷
|
②(9×
|
③
|
④(
|
分析:依据四则运算顺序: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解答.
解答:解:①10÷
+
×4,
=18+
,
=18
;
②(9×
-
)÷
,
=(
-
)÷
,
=
÷
,
=0.5;
③
×[1-(
-
)],
=
×[1-
],
=
×
,
=
;
④(
+
)×
÷
,
=
×
÷
,
=
÷
,
=
.
| 5 |
| 9 |
| 1 |
| 6 |
=18+
| 2 |
| 3 |
=18
| 2 |
| 3 |
②(9×
| 5 |
| 6 |
| 73 |
| 10 |
| 2 |
| 5 |
=(
| 15 |
| 2 |
| 73 |
| 10 |
| 2 |
| 5 |
=
| 1 |
| 5 |
| 2 |
| 5 |
=0.5;
③
| 4 |
| 29 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 5 |
| 8 |
=
| 5 |
| 58 |
④(
| 5 |
| 6 |
| 2 |
| 9 |
| 4 |
| 5 |
| 19 |
| 20 |
=
| 19 |
| 18 |
| 4 |
| 5 |
| 19 |
| 20 |
=
| 76 |
| 90 |
| 19 |
| 20 |
=
| 8 |
| 9 |
点评:本题考查知识点:依据四则运算顺序,正确进行计算.
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