
简便计算. 3.72×99%+3
简便计算.3.72×99%+3.72×0.01125×57×80%12.9-37%-63%79×99%...
简便计算. 3.72×99%+3.72×0.01 125×57×80% 12.9-37%-63% 79×99%
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①3.72×99%+3.72×0.01,
=3.72×(0.99+0.01),
=3.72×1,
=3.72;
②125×57×80%,
=(125×0.8)×57,
=100×57,
=5700;
③12.9-37%-63%,
=12.9-(0.37+0.63),
=12.9-1,
=11.9;
④79×99%,
=79×(1-0.01),
=79×1-79×0.01,
=79-0.79,
=78.21.
=3.72×(0.99+0.01),
=3.72×1,
=3.72;
②125×57×80%,
=(125×0.8)×57,
=100×57,
=5700;
③12.9-37%-63%,
=12.9-(0.37+0.63),
=12.9-1,
=11.9;
④79×99%,
=79×(1-0.01),
=79×1-79×0.01,
=79-0.79,
=78.21.

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