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7.9×12.5 4.44×2.5 巧算
人气：456 ℃　时间：2020-06-04 09:51:03
解答
7.9×12.5
=（8-0.1）x12.5
=8x12.5-0.1x12.5
=100-1.25
=98.75
4.44×2.5
=1.11x4x2.5
=1.11x10
=11.1
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