题目内容
脱式计算下面各题,能简算的要简算
9750÷25+75; | (2.32+1.8)×6.5; | 101×7.8; | |||||||||||||||
|
|
分析:本题中,101×7.8可按100×7.8+7.8进行简算;其它各式据四则混合运算的运算法则计算即可.
解答:解:(1)9750÷25+75
=390+75,
=465;
(2)(2.32+1.8)×6.5
=4.12×6.5,
=26.78;
(3)101×7.8
=100×7.8+7.8,
=780+7.8,
=787.8;
(4)
×
+
÷
=
+3,
=3
;
(5)
÷[
-(
+
)]
=
÷[
-
],
=
÷
,
=
.
=390+75,
=465;
(2)(2.32+1.8)×6.5
=4.12×6.5,
=26.78;
(3)101×7.8
=100×7.8+7.8,
=780+7.8,
=787.8;
(4)
5 |
8 |
8 |
15 |
3 |
4 |
1 |
4 |
=
1 |
3 |
=3
1 |
3 |
(5)
1 |
3 |
3 |
4 |
1 |
18 |
5 |
12 |
=
1 |
3 |
3 |
4 |
17 |
36 |
=
1 |
3 |
10 |
36 |
=
6 |
5 |
点评:完成各题时要认真计算,注意通分约分.
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