简便计算:986×89-987×88

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简便计算:986×89-987×88简便计算:986×89-987×88简便计算:986×89-987×88986×89-987×88=986×89-(986+1)×88=986×89-986×88-

简便计算:986×89-987×88
简便计算:986×89-987×88

简便计算:986×89-987×88
986×89-987×88=986×89-(986+1)×88=986×89-986×88-88=986-88=898

986×89-987×88=986×89-(986+1)×(88-1)=986×89-986×89+1=1

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