65.4-25.4×2的简便计算？
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65.4-25.4×2
=65.4-(25+0.4)×2
=65.4-(25×2+0.4×2)
=65.4-(50+0.8)
=65.4-50-0.8
=15.4-0.8
=14.6
=65.4-(25+0.4)×2
=65.4-(25×2+0.4×2)
=65.4-(50+0.8)
=65.4-50-0.8
=15.4-0.8
=14.6
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