题目内容
脱式计算,能简算的要简算
| 2.05+0.82+33.6 | 18.9×2.47-8.9×2.47 | 2.33×0.5×4 | 2.8×101 |
(1)2.05+0.82+33.6,
=2.87+33.6,
=36.47;
(2)18.9×2.47-8.9×2.47,
=(18.9-8.9)×2.47,
=10×2.47,
=24.7;
(3)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(4)2.8×101,
=2.8×(100+1),
=2.8×100+2.8×1,
=280+2.8,
=282.8.
=2.87+33.6,
=36.47;
(2)18.9×2.47-8.9×2.47,
=(18.9-8.9)×2.47,
=10×2.47,
=24.7;
(3)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(4)2.8×101,
=2.8×(100+1),
=2.8×100+2.8×1,
=280+2.8,
=282.8.
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