986×89-987×88

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986×89-987×88

986×89-987×88
986×89-987×88

986×89-987×88
986×89-987×88
=986×89-986×88 -88
=986×(89-88)-88
=986-88
=986-100+12
=898

=986×88+986-986×88-88
=986-88
=898

原式=986*88+986-986*88+88=986+88=1174

=986*89-986*88-88
=986-88
=898

原式=986*(89-88)-88
=986-88
=898

986×89-987×88
=986×(88+1)-(986+1)×88
=986X88+986-986X88-88
=986-88
=898

=986×88+986-986×88-88
=986-88
=898 (我是3年级的尖子)

89*(986-987)+987=898

=986×88+986-987×88
=(986-987)×88+986
=-88+986
=898

986×89-987×88
=986×(88+1)-(986+1)×88
=986×88+986-986×88-88
=986-88
=986-86-2
=900-2
=898