题目内容
脱式计算.
(1)
÷(
-
)×
(2)
-(
-
)÷
(3)
÷
+
×
.
(1)
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
(2)
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 5 |
| 7 |
| 10 |
(3)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
分析:(1)按照先算括号里面的减法,再算除法,最后算乘法顺序解答,
(2)按照先算括号里面的减法,再算除法,最后算减法顺序解答,
(3)运用乘法分配律解答.
(2)按照先算括号里面的减法,再算除法,最后算减法顺序解答,
(3)运用乘法分配律解答.
解答:解:(1)
÷(
-
)×
=
÷
×
=
×
=
;
(2)
-(
-
)÷
=
-
÷
=
-
=
;
(3)
÷
+
×
=(
+
)×
=1×
=
.
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 4 |
| 15 |
| 3 |
| 5 |
=
| 5 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 4 |
(2)
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 5 |
| 7 |
| 10 |
=
| 1 |
| 2 |
| 3 |
| 20 |
| 7 |
| 10 |
=
| 1 |
| 2 |
| 3 |
| 14 |
=
| 2 |
| 7 |
(3)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)运用简便方法解决问题.
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