题目内容
| 脱式计算,能简算的要简算. ①480-48+124 | ②1.25×3.2×0.25 | ③(
| ||||||||||||
④(
| ⑤3.45÷[0.3×(2.3-1.8)] | ⑥
|
(1)480-48+124,
=432+124,
=556;
(2)1.25×3.2×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
(3)(
+
)×3+
,
=
×3+
×3+
,
=(
+
)+1,
=1+1,
=2;
(4)(
-
)×30,
=
×30-
×30,
=20-12,
=8;
(5)3.45÷[0.3×(2.3-1.8)],
=3.45÷[0.3×0.5],
=3.45÷0.15,
=23;
(6)
×[(
-
)÷
],
=
×[
÷
],
=
×
,
=
.
=432+124,
=556;
(2)1.25×3.2×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
(3)(
| 7 |
| 23 |
| 1 |
| 3 |
| 2 |
| 23 |
=
| 7 |
| 23 |
| 1 |
| 3 |
| 2 |
| 23 |
=(
| 21 |
| 23 |
| 2 |
| 23 |
=1+1,
=2;
(4)(
| 2 |
| 3 |
| 2 |
| 5 |
=
| 2 |
| 3 |
| 2 |
| 5 |
=20-12,
=8;
(5)3.45÷[0.3×(2.3-1.8)],
=3.45÷[0.3×0.5],
=3.45÷0.15,
=23;
(6)
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 4 |
| 5 |
=
| 2 |
| 3 |
| 2 |
| 15 |
| 4 |
| 5 |
=
| 2 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 9 |
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