题目内容
6÷
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|
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15÷1%= | ||||||||||||||||||||
1.05-
|
|
(
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|
X:
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|
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(
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分析:(1)除以一个数等于乘这个数的倒数;
(2)把
和10%化为小数;
(3)注意约分;
(4)把1%化为小数;
(5)把
化为小数;
(6)把除法改为乘法,再计算;
(7)先算括号内的,再算括号外的;
(8)按运算顺序,从左向右依次计算;
(9)根据等式的性质,两边先乘9,再减去8即可;
(10)根据比例的基本性质改写成
X=
×12,再根据等式的性质,两边同乘5即可;
(11)根据比例的基本性质改写成0.5X=3.2,再根据等式的性质,两边同除以0.5即可;
(12)按运算顺序,先算括号内的,再算括号外的;
(12)用乘法分配律的逆运算简算;
(13)按运算顺序,先算括号内的,再算括号外的;
(14)(15)题按运算顺序,先算括号内的,再算括号外的.
(2)把
3 |
4 |
(3)注意约分;
(4)把1%化为小数;
(5)把
1 |
2 |
(6)把除法改为乘法,再计算;
(7)先算括号内的,再算括号外的;
(8)按运算顺序,从左向右依次计算;
(9)根据等式的性质,两边先乘9,再减去8即可;
(10)根据比例的基本性质改写成
1 |
5 |
1 |
4 |
(11)根据比例的基本性质改写成0.5X=3.2,再根据等式的性质,两边同除以0.5即可;
(12)按运算顺序,先算括号内的,再算括号外的;
(12)用乘法分配律的逆运算简算;
(13)按运算顺序,先算括号内的,再算括号外的;
(14)(15)题按运算顺序,先算括号内的,再算括号外的.
解答:解:(1)6÷
,
=6×
,
=8;
(2)
×10%,
=0.75×0.1,
=0.075;
(3)
×8=6;
(4)15÷1%,
=15÷0.01,
=1500;
(5)1.05-
,
=1.05-0.5,
=0.55;
(6)
÷
,
=
×
,
=
;
(7)(
-
)×
,
=
×
,
=
;
(8)
×
÷
×
,
=
×
×
×
,
=
;
(9)
+
X=2,
(
+
X)×=2×9,
8+X=18,
8+X-8=18-8,
X=10;
(10)X:
=12:
,
X=
×12,
X×5=
×12×5,
X=15;
(11)
=0.5,
0.5X=3.2,
0.5X÷0.5=3.2÷0.5,
X=6.4;
(12)
÷(1-
)×
,
=
÷
×
,
=
×
×
,
=
;
(13)
×
+40%×
,
=
×(
+
),
=
;
(14)
÷(
+
),
=
÷(
+
),
=
×
,
=
;
(15)(
+
)×
+
,
=
×
+
×
+
,
=
+
+
,
=
+1,
=1
.
3 |
4 |
=6×
4 |
3 |
=8;
(2)
3 |
4 |
=0.75×0.1,
=0.075;
(3)
3 |
4 |
(4)15÷1%,
=15÷0.01,
=1500;
(5)1.05-
1 |
2 |
=1.05-0.5,
=0.55;
(6)
2 |
3 |
3 |
2 |
=
2 |
3 |
2 |
3 |
=
4 |
9 |
(7)(
1 |
4 |
1 |
5 |
1 |
20 |
=
1 |
20 |
1 |
20 |
=
1 |
400 |
(8)
3 |
4 |
5 |
6 |
5 |
6 |
3 |
4 |
=
3 |
4 |
5 |
6 |
6 |
5 |
3 |
4 |
=
9 |
16 |
(9)
8 |
9 |
1 |
9 |
(
8 |
9 |
1 |
9 |
8+X=18,
8+X-8=18-8,
X=10;
(10)X:
1 |
4 |
1 |
5 |
1 |
5 |
1 |
4 |
1 |
5 |
1 |
4 |
X=15;
(11)
3.2 |
X |
0.5X=3.2,
0.5X÷0.5=3.2÷0.5,
X=6.4;
(12)
5 |
6 |
9 |
20 |
1 |
5 |
=
5 |
6 |
11 |
20 |
1 |
5 |
=
5 |
6 |
20 |
11 |
1 |
5 |
=
10 |
33 |
(13)
2 |
5 |
6 |
11 |
5 |
11 |
=
2 |
5 |
5 |
11 |
6 |
11 |
=
2 |
5 |
(14)
9 |
16 |
3 |
8 |
1 |
16 |
=
9 |
16 |
6 |
16 |
1 |
16 |
=
9 |
16 |
16 |
7 |
=
9 |
7 |
(15)(
24 |
19 |
16 |
17 |
1 |
8 |
15 |
17 |
=
24 |
19 |
1 |
8 |
16 |
17 |
1 |
8 |
15 |
17 |
=
3 |
19 |
2 |
17 |
15 |
17 |
=
3 |
19 |
=1
3 |
19 |
点评:此题主要考查学生对四则混合运算顺序的掌握,同时考查了解方程和解比例的能力.

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