25×1.2-1.87简便计算 = = =

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25×1.2-1.87简便计算 = = =
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25×1.2-1.87简便计算 = = =
25×1.2-1.87简便计算 = = =

25×1.2-1.87简便计算 = = =
=25X4X0.3-1.87
=100X0.3-1.87
=30-1.87
=28.13