用简便方法计算 2.5x3.2x1.25 1.98x9.9
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发布时间:2022-04-23 19:58
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热心网友
时间:2023-10-09 10:19
2.5x3.2x1.25
=2.5×4×0.8×1.25
=10×1
=10
1.98x9.9
=1.98×(10-0.1)
=19.8-0.198
=19.602
热心网友
时间:2023-10-09 10:19
2.5×3.2×1.25
=2.5×4×0.8×1.25
=2.5×4×(0.8×1.25)
=10×1
=10
1.98×9.9
=1.98×(10-0.1)
=1.98×10-1.98×0.1
=19.8-0.198
=19.602