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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