脱式计算,能简算的要简算.1.25×4.85.5×9.9+0.1×5.53.4
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发布时间:2024-09-25 21:27
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时间:2024-11-15 03:28
①1.25×4.8,
=1.25×8×0.6,
=10×0.6,
=6;
②5.5×9.9+0.1×5.5,
=(9.9+0.1)×5.5,
=10×5.5,
=55;
③3.45×102,
=3.45×(100+2),
=3.45×100+3.45×2,
=345+6.9,
=351.9;
④3.17+0.83×1.6,
=3.17+1.328,
=4.498.