题目内容
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(
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3
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36×
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分析:(1)、(3)、(5)、(6)、(7)根据乘法分配律进行简算;
(2)根据乘法交换律进行简算;
(4)先算加法,再算乘法;
(8)按照从左向右的顺序进行计算.
(2)根据乘法交换律进行简算;
(4)先算加法,再算乘法;
(8)按照从左向右的顺序进行计算.
解答:解:
(1)
×101-
,
=
×(101-1),
=
×100,
=70;
(2)
×
÷
×
,
=
÷
×
×
,
=1×
×
,
=
;
(3)
×99+
,
=
×(99+1)
=
×100,
=60;
(4)(
+
)×
,
=
×
,
=
;
(5)
×
+
×
-
,
=(
+
-1)×
,
=
×
,
=
;
(6)3
×25,
=(3+
)×25,
=3×25+
×25,
=75+20,
=95;
(7)36×
,
=(35+1)×
,
=35×
+1×
,
=34+
,
=34
;
(8)
-
-
,
=
-
,
=-
.
(1)
| 7 |
| 10 |
| 7 |
| 10 |
=
| 7 |
| 10 |
=
| 7 |
| 10 |
=70;
(2)
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
=
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
=1×
| 8 |
| 9 |
| 8 |
| 9 |
=
| 64 |
| 81 |
(3)
| 3 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
=60;
(4)(
| 4 |
| 7 |
| 8 |
| 9 |
| 2 |
| 25 |
=
| 92 |
| 63 |
| 2 |
| 25 |
=
| 184 |
| 1575 |
(5)
| 15 |
| 21 |
| 3 |
| 4 |
| 10 |
| 21 |
| 3 |
| 4 |
| 3 |
| 4 |
=(
| 15 |
| 21 |
| 10 |
| 21 |
| 3 |
| 4 |
=
| 4 |
| 21 |
| 3 |
| 4 |
=
| 1 |
| 7 |
(6)3
| 4 |
| 5 |
=(3+
| 4 |
| 5 |
=3×25+
| 4 |
| 5 |
=75+20,
=95;
(7)36×
| 34 |
| 35 |
=(35+1)×
| 34 |
| 35 |
=35×
| 34 |
| 35 |
| 34 |
| 35 |
=34+
| 34 |
| 35 |
=34
| 34 |
| 35 |
(8)
| 5 |
| 6 |
| 5 |
| 9 |
| 18 |
| 5 |
=
| 15 |
| 54 |
| 18 |
| 5 |
=-
| 897 |
| 270 |
点评:此题主要考查分数、整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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