题目内容
脱式计算
32×0.16×2.5×1.25
6.4×4.2-4.2×
(0.3+
)×1.6-
9÷[1-(
+
)].
32×0.16×2.5×1.25
6.4×4.2-4.2×
| 2 |
| 5 |
(0.3+
| 1 |
| 5 |
| 4 |
| 5 |
9÷[1-(
| 2 |
| 5 |
| 9 |
| 20 |
(1)32×0.16×2.5×1.25,
=8×4×0.16×2.5×1.25,
=(8×1.25)×(4×2.5)×0.16,
=10×10×0.16,
=100×0.16,
=16;
(2)6.4×4.2-4.2×
,
=4.2×(6.4-0.4),
=4.2×6,
=25.2;
(3)(0.3+
)×1.6-
,
=0.5×1.6-0.8,
=0.8-0.8,
=0;
(4)9÷[1-(
+
)],
=9÷[1-
],
=9÷
,
=60.
=8×4×0.16×2.5×1.25,
=(8×1.25)×(4×2.5)×0.16,
=10×10×0.16,
=100×0.16,
=16;
(2)6.4×4.2-4.2×
| 2 |
| 5 |
=4.2×(6.4-0.4),
=4.2×6,
=25.2;
(3)(0.3+
| 1 |
| 5 |
| 4 |
| 5 |
=0.5×1.6-0.8,
=0.8-0.8,
=0;
(4)9÷[1-(
| 2 |
| 5 |
| 9 |
| 20 |
=9÷[1-
| 17 |
| 20 |
=9÷
| 3 |
| 20 |
=60.
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