用简便方法计算. 7.2×0.5+0.5×2.8
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解决时间 2021-04-02 01:22
- 提问者网友:你独家记忆
- 2021-04-01 16:27
用简便方法计算. 7.2×0.5+0.5×2.8
最佳答案
- 五星知识达人网友:患得患失的劫
- 2021-04-01 16:45
(1)7.2×0.5+0.5×2.8,
=(7.2+2.8)×0.5,
=10×0.5,
=5;
(2)3.57×0.125×8,
=3.57×(0.125×8),
=3.57×1,
=3.57;
(3)2.8×101,
=2.8×100+2.8×1,
=280+2.8,
=282.8;
(4)3.5×98,
=3.5×(100-2),
=3.5×100-3.5×2,
=350-7,
=343.
=(7.2+2.8)×0.5,
=10×0.5,
=5;
(2)3.57×0.125×8,
=3.57×(0.125×8),
=3.57×1,
=3.57;
(3)2.8×101,
=2.8×100+2.8×1,
=280+2.8,
=282.8;
(4)3.5×98,
=3.5×(100-2),
=3.5×100-3.5×2,
=350-7,
=343.
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