题目内容
想一想算一算,能用简便计算的用简便计算.
| 0.25×8×125×4 | 9.8×25 | [16.7-(6.2+9.5)]×8.3 | 0.9×99+0.9. |
(1)0.25×8×125×4,
=(0.25×4)×(8×125),
=1×1000,
=1000;
(2)9.8×25,
=(10-0.2)×25,
=10×25-0.2×25,
=250-5,
=245;
(3)[16.7-(6.2+9.5)]×8.3,
=[16.7-15.7]×8.3,
=1×8.3,
=8.3;
(4)0.9×99+0.9,
=0.9×(99+1),
=0.9×100,
=90.
=(0.25×4)×(8×125),
=1×1000,
=1000;
(2)9.8×25,
=(10-0.2)×25,
=10×25-0.2×25,
=250-5,
=245;
(3)[16.7-(6.2+9.5)]×8.3,
=[16.7-15.7]×8.3,
=1×8.3,
=8.3;
(4)0.9×99+0.9,
=0.9×(99+1),
=0.9×100,
=90.
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