题目内容
| 递等式计算(能简便的要简便) 25.3×12-33.46÷0.35 | (
| 2.5×13×0.4 | ||||||||||||
| 9.34-(2.34+0.49) |
|
(1)25.3×12-33.46÷0.35,
=303.6-95.6,
=208;
(2)(
+
)÷
,
=(
+
)÷
,
=
×24,
=29;
(3)2.5×13×0.4,
=(2.5×0.4)×13,
=1×13,
=13;
(4)
÷[(
+
)×
],
=
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(5)9.34-(2.34+0.49),
=(9.34-2.34)-0.49,
=7-0.49,
=6.51;
(6)
+
×19,
=(1+19)×
,
=20×
,
=16.
=303.6-95.6,
=208;
(2)(
| 3 |
| 8 |
| 5 |
| 6 |
| 1 |
| 24 |
=(
| 9 |
| 24 |
| 20 |
| 24 |
| 1 |
| 24 |
=
| 29 |
| 24 |
=29;
(3)2.5×13×0.4,
=(2.5×0.4)×13,
=1×13,
=13;
(4)
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 4 |
| 10 |
| 1 |
| 10 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 1 |
| 2 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 8 |
=
| 8 |
| 9 |
| 8 |
| 3 |
=
| 64 |
| 27 |
(5)9.34-(2.34+0.49),
=(9.34-2.34)-0.49,
=7-0.49,
=6.51;
(6)
| 4 |
| 5 |
| 4 |
| 5 |
=(1+19)×
| 4 |
| 5 |
=20×
| 4 |
| 5 |
=16.
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