如何简便计算:986×89-987×88
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如何简便计算:986×89-987×88
如何简便计算:986×89-987×88
如何简便计算:986×89-987×88
986×89-987×88
=986×(88+1)-(986+1)×88
=986×88+986-986×88-88
=(986×88-986×88)+(986-88)
=898
986*(88+1)-(986+1)*88=986-88=898
986*88+986-987+88=88*(986+1)-1=86855
986×89-987×88
=986×(88+1)-(986+1)×88
=986×88+986-986×88-88
=(986×88-986×88)+(986-88)
=0+898
=898
898