题目内容
怎样算简便就怎样算
×
+
÷6
÷[
×(
-
)]
24×
×
(
+
)×24.
| 7 |
| 10 |
| 1 |
| 6 |
| 3 |
| 10 |
| 9 |
| 23 |
| 4 |
| 3 |
| 7 |
| 16 |
| 1 |
| 4 |
24×
| 5 |
| 7 |
| 7 |
| 12 |
(
| 2 |
| 3 |
| 1 |
| 6 |
分析:(1)将除法变为乘法,根据乘法分配律简便计算;
(2)先算小括号里面的减法,再算中括号里面的乘法,再算括号外面的;
(3)约分计算即可求解;
(4)根据乘法分配律简便计算.
(2)先算小括号里面的减法,再算中括号里面的乘法,再算括号外面的;
(3)约分计算即可求解;
(4)根据乘法分配律简便计算.
解答:解:(1)
×
+
÷6
=
×
+
×
=(
+
)×
=1×
=
;
(2)
÷[
×(
-
)]
=
÷[
×
]
=
÷
=
;
(3)24×
×
=10;
(4)(
+
)×24
=
×24+
×24
=16+4
=20.
| 7 |
| 10 |
| 1 |
| 6 |
| 3 |
| 10 |
=
| 7 |
| 10 |
| 1 |
| 6 |
| 3 |
| 10 |
| 1 |
| 6 |
=(
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
(2)
| 9 |
| 23 |
| 4 |
| 3 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 9 |
| 23 |
| 4 |
| 3 |
| 3 |
| 16 |
=
| 9 |
| 23 |
| 1 |
| 4 |
=
| 36 |
| 23 |
(3)24×
| 5 |
| 7 |
| 7 |
| 12 |
(4)(
| 2 |
| 3 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 6 |
=16+4
=20.
点评:此题主要考查分数的四则混合运算的运算顺序和运算法则,以及应用运算定律进行简便计算.
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