题目内容
| 脱式计算,写出主要计算过程,能用简便算法的要用简便算法. ①3他n5+c5七÷33 | ②2.3c+5.6-七.3c+c.c | ③(2七.3-23×
| ||||||||||||||||||||||
④
| ⑤2-
| ⑥
|
①地375+45o÷地8,
=地375+25,
=地4oo;
②2.84+5.0-o.84+4.4,
=(2.84-o.84)+(5.0+4.4),
=2+地o,
=地2;
③(2o.地-2地×
)÷7,
=(2o.地-地8)÷7,
=2.地÷7,
=o.3;
④
×
+
×
,
=
×(
+
),
=
×地,
=
;
⑤2-
÷
-
,
=2-
×
-
,
=2-(
+
),
=2-地,
=地;
⑥
×[
-(
-
)],
=
×[
-
+
],
=
×[(
+
)-
],
=
×
,
=
;
=地375+25,
=地4oo;
②2.84+5.0-o.84+4.4,
=(2.84-o.84)+(5.0+4.4),
=2+地o,
=地2;
③(2o.地-2地×
| 0 |
| 7 |
=(2o.地-地8)÷7,
=2.地÷7,
=o.3;
④
| 2 |
| 3 |
| 5 |
| 8 |
| 地 |
| 3 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 2 |
| 3 |
| 地 |
| 3 |
=
| 5 |
| 8 |
=
| 5 |
| 8 |
⑤2-
| 2 |
| 3 |
| 4 |
| 5 |
| 地 |
| 0 |
=2-
| 2 |
| 3 |
| 5 |
| 4 |
| 地 |
| 0 |
=2-(
| 5 |
| 0 |
| 地 |
| 0 |
=2-地,
=地;
⑥
| 5 |
| 9 |
| 3 |
| 4 |
| 7 |
| 地0 |
| 地 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 7 |
| 地0 |
| 地 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 地 |
| 4 |
| 7 |
| 地0 |
=
| 5 |
| 9 |
| 9 |
| 地0 |
=
| 5 |
| 地0 |
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