题目内容
| 脱式计算(③④⑤小题用简便方法). ①635+9030÷86×13 | ②4.1-2.56÷(0.18+0.62) | ③45×101 | ||||||||||||
| ④5.7-(1.9-1.3) | ⑤
| ⑥
|
①635+9030÷86×13,
=635+105×13,
=635+1365,
=2000;
②4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
③45×101,
=45×(100+1),
=4500+45,
=4545;
④5.7-(1.9-1.3),
=5.7-1.9+1.3,
=5.7+1.3-1.9,
=7-1.9,
=5.1;
⑤
+
×98,
=
×(1+98),
=
×99,
=98;
⑥
÷〔
×(
+
)〕,
=
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
,
=2
.
=635+105×13,
=635+1365,
=2000;
②4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
③45×101,
=45×(100+1),
=4500+45,
=4545;
④5.7-(1.9-1.3),
=5.7-1.9+1.3,
=5.7+1.3-1.9,
=7-1.9,
=5.1;
⑤
| 98 |
| 99 |
| 98 |
| 99 |
=
| 98 |
| 99 |
=
| 98 |
| 99 |
=98;
⑥
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 6 |
| 2 |
| 6 |
=
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
=
| 4 |
| 5 |
| 5 |
| 16 |
=
| 4 |
| 5 |
| 16 |
| 5 |
=
| 64 |
| 25 |
=2
| 14 |
| 25 |
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