题目内容
| 灵活计算下面各题. 2-2÷3-
| 25×2.5×32 |
| ||||||||||
| 5.02-1.37-2.63 | 20%+
|
|
(1)2-2÷3-
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(2)25×2.5×32,
=25×2.5×4×4×2,
=(25×4)×(2.5×4)×2,
=100×10×2,
=1000×2,
=2000;
(3)
×(
+
)+0.8,
=
×
+
×
+0.8,
=2+
+
,
=2+(
+
),
=2+2,
=4;
(4)5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;
(5)20%+
+80%-
,
=(20%+80%)+(
-
),
=1+0,
=1;
(6)
÷7+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
| 1 |
| 3 |
=2-
| 2 |
| 3 |
| 1 |
| 3 |
=2-(
| 2 |
| 3 |
| 1 |
| 3 |
=2-1,
=1;
(2)25×2.5×32,
=25×2.5×4×4×2,
=(25×4)×(2.5×4)×2,
=100×10×2,
=1000×2,
=2000;
(3)
| 12 |
| 5 |
| 5 |
| 6 |
| 1 |
| 2 |
=
| 12 |
| 5 |
| 5 |
| 6 |
| 12 |
| 5 |
| 1 |
| 2 |
=2+
| 6 |
| 5 |
| 4 |
| 5 |
=2+(
| 6 |
| 5 |
| 4 |
| 5 |
=2+2,
=4;
(4)5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;
(5)20%+
| 4 |
| 7 |
| 4 |
| 7 |
=(20%+80%)+(
| 4 |
| 7 |
| 4 |
| 7 |
=1+0,
=1;
(6)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 1 |
| 7 |
| 8 |
| 13 |
| 5 |
| 13 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
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