340×68 500×32 140×32简便计算

340×68+500×32+140×32
=（640-300）x68+(500+140)x32
=640x68-300x68+640x32
=640x(68+32)-20400
=640x100-20400
=64000-20400
=43600

行家正解，不明白可以追问！祝您学习进步
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