题目内容
6÷
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|
|
15÷1%= | ||||||||||||||||||||
1.05-
|
|
(
|
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|
X:
|
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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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