题目内容
计算,能简算的要简算.
÷8+
×
×
÷
×
+
×[9÷(
×9)].
| 7 |
| 13 |
| 1 |
| 8 |
| 6 |
| 13 |
| 11 |
| 23 |
| 7 |
| 9 |
| 22 |
| 23 |
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 10 |
| 1 |
| 9 |
| 1 |
| 9 |
分析:(1)把除法改为乘法,运用乘法分配律简算;
(2)把除法改为乘法,约分计算;
(3)先算乘法,再算加法;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
(2)把除法改为乘法,约分计算;
(3)先算乘法,再算加法;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)
÷8+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)
×
÷
,
=
×
×
=
;
(3)
×
+
,
=
+
,
=
;
(4)
×[9÷(
×9)],
=
×[9÷1],
=
×9,
=1.
| 7 |
| 13 |
| 1 |
| 8 |
| 6 |
| 13 |
=
| 7 |
| 13 |
| 1 |
| 8 |
| 1 |
| 8 |
| 6 |
| 13 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
| 1 |
| 8 |
=1×
| 1 |
| 8 |
=
| 1 |
| 8 |
(2)
| 11 |
| 23 |
| 7 |
| 9 |
| 22 |
| 23 |
=
| 11 |
| 23 |
| 7 |
| 9 |
| 23 |
| 22 |
=
| 7 |
| 18 |
(3)
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 10 |
=
| 1 |
| 3 |
| 3 |
| 10 |
=
| 19 |
| 30 |
(4)
| 1 |
| 9 |
| 1 |
| 9 |
=
| 1 |
| 9 |
=
| 1 |
| 9 |
=1.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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