题目内容
| 用递等式计算下列各题. 496+250×16 | 10.2-(1.25+2.5)÷1.5 |
|
|
(1)496+250×16,
=496+250×4×4,
=496+1000×4,
=496+4000,
=4496;
(2)10.2-(1.25+2.5)÷1.5,
=10.2-3.75÷1.5,
=10.2-2.5,
=7.7;
(3)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
.
=496+250×4×4,
=496+1000×4,
=496+4000,
=4496;
(2)10.2-(1.25+2.5)÷1.5,
=10.2-3.75÷1.5,
=10.2-2.5,
=7.7;
(3)
| 3 |
| 7 |
| 5 |
| 6 |
| 4 |
| 7 |
| 6 |
| 5 |
=
| 3 |
| 7 |
| 6 |
| 5 |
| 4 |
| 7 |
| 6 |
| 5 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 6 |
| 5 |
=1×
| 6 |
| 5 |
=
| 6 |
| 5 |
(4)
| 9 |
| 20 |
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 9 |
| 20 |
| 3 |
| 4 |
| 11 |
| 15 |
=
| 9 |
| 20 |
| 11 |
| 20 |
=
| 9 |
| 11 |
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