题目内容
怎样算简便就怎样计算.
(1)2.8+[2.4÷(90-60)]
(2)0.4×7+
×3-0.4×3
(3)0.125×0.25×32
(4)
×
+
×
.
(1)2.8+[2.4÷(90-60)]
(2)0.4×7+
| 2 |
| 5 |
(3)0.125×0.25×32
(4)
| 8 |
| 21 |
| 3 |
| 4 |
| 7 |
| 12 |
| 4 |
| 7 |
(1)2.8+[2.4÷(90-60)],
=2.8+[2.4÷30],
=2.8+0.08,
=2.88;
(2)0.4×7+
×3-0.4×3,
=0.4×7+0.4×3-0.4×3,
=0.4×(7+3-3),
=0.4×7,
=2.8;
(3)0.125×0.25×32,
=0.125×0.25×4×8,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(4)
×
+
×
,
=
+
,
=
.
=2.8+[2.4÷30],
=2.8+0.08,
=2.88;
(2)0.4×7+
| 2 |
| 5 |
=0.4×7+0.4×3-0.4×3,
=0.4×(7+3-3),
=0.4×7,
=2.8;
(3)0.125×0.25×32,
=0.125×0.25×4×8,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(4)
| 8 |
| 21 |
| 3 |
| 4 |
| 7 |
| 12 |
| 4 |
| 7 |
=
| 2 |
| 7 |
| 1 |
| 3 |
=
| 13 |
| 21 |
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