题目内容
用简便方法计算.
23-
-
(
+
)×20
0.4×1.25×25×8.
23-
12 |
17 |
5 |
17 |
(
3 |
4 |
2 |
5 |
0.4×1.25×25×8.
(1)23-
-
,
=23-(
+
),
=23-1,
=22;
(2)(
+
)×20,
=
×20+
×20,
=15+8,
=23;
(3)0.4×1.25×25×8,
=(0.4×25)×(1.25×8),
=10×10,
=100.
12 |
17 |
5 |
17 |
=23-(
12 |
17 |
5 |
17 |
=23-1,
=22;
(2)(
3 |
4 |
2 |
5 |
=
3 |
4 |
2 |
5 |
=15+8,
=23;
(3)0.4×1.25×25×8,
=(0.4×25)×(1.25×8),
=10×10,
=100.
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