题目内容
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1
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1÷
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4
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2-
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(
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(
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分析:(1)先把37.5分解成
×100,再运用乘法分配律简算;
(2)(3)按照从左到右的顺序计算;
(4)(8)(10)运用乘法分配律简算;
(5)先算乘法,再算除法,最后算减法;
(6)先算除法,再运用减法的性质简算;
(7)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的除法;
(9)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外鹅除法;
(11)(12)先把除法变成乘法,再运用乘法分配律简算.
| 3 |
| 8 |
(2)(3)按照从左到右的顺序计算;
(4)(8)(10)运用乘法分配律简算;
(5)先算乘法,再算除法,最后算减法;
(6)先算除法,再运用减法的性质简算;
(7)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的除法;
(9)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外鹅除法;
(11)(12)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)
×101-37.5,
=
×101-
×100,
=
×(101-100),
=
×1,
=
;
(2)1
×360÷7,
=
×360×
,
=420×
,
=60;
(3)1÷
÷
,
=100÷
,
=10000;
(4)4
×13
-4
×3.6,
=4
×(13
-3
),
=4
×10,
=48;
(5)
-
×
÷
,
=
-
÷
,
=
-
,
=
;
(6)2-
-
÷
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(7)
÷(
+
×
),
=
÷(
+
),
=
÷1,
=
;
(8)(
+
)×48,
=
×48+
×48,
=40+18,
=58;
(9)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
;
(10)(
+
)×30,
=30×
+
×30,
=25+24,
=49;
(11)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(12)
÷23+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
| 3 |
| 8 |
=
| 3 |
| 8 |
| 3 |
| 8 |
=
| 3 |
| 8 |
=
| 3 |
| 8 |
=
| 3 |
| 8 |
(2)1
| 1 |
| 6 |
=
| 7 |
| 6 |
| 1 |
| 7 |
=420×
| 1 |
| 7 |
=60;
(3)1÷
| 1 |
| 100 |
| 1 |
| 1000 |
=100÷
| 1 |
| 1000 |
=10000;
(4)4
| 4 |
| 5 |
| 3 |
| 5 |
| 4 |
| 5 |
=4
| 4 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
=4
| 4 |
| 5 |
=48;
(5)
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
| 5 |
| 2 |
=
| 2 |
| 5 |
| 3 |
| 10 |
| 5 |
| 2 |
=
| 2 |
| 5 |
| 3 |
| 25 |
=
| 7 |
| 25 |
(6)2-
| 5 |
| 9 |
| 4 |
| 15 |
| 3 |
| 5 |
=2-
| 5 |
| 9 |
| 4 |
| 9 |
=2-(
| 5 |
| 9 |
| 4 |
| 9 |
=2-1,
=1;
(7)
| 6 |
| 7 |
| 4 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 6 |
| 7 |
| 4 |
| 9 |
| 5 |
| 9 |
=
| 6 |
| 7 |
=
| 6 |
| 7 |
(8)(
| 5 |
| 6 |
| 3 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 8 |
=40+18,
=58;
(9)
| 14 |
| 15 |
| 4 |
| 5 |
| 2 |
| 3 |
| 10 |
| 11 |
=
| 14 |
| 15 |
| 22 |
| 15 |
| 10 |
| 11 |
=
| 14 |
| 15 |
| 4 |
| 5 |
=
| 7 |
| 6 |
(10)(
| 5 |
| 6 |
| 4 |
| 5 |
=30×
| 5 |
| 6 |
| 4 |
| 5 |
=25+24,
=49;
(11)
| 2 |
| 5 |
| 5 |
| 9 |
| 2 |
| 5 |
| 9 |
| 4 |
=
| 2 |
| 5 |
| 5 |
| 9 |
| 2 |
| 5 |
| 4 |
| 9 |
=
| 2 |
| 5 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
(12)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 1 |
| 23 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 1 |
| 23 |
=
| 1 |
| 23 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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