如题所述
第1个回答 2016-11-18
799x79
=(800-1)x(80-1)
=800x80-880+1
=64000-880+1
=63121本回答被网友采纳
=(800-1)x(80-1)
=800x80-880+1
=64000-880+1
=63121本回答被网友采纳
第2个回答 2016-11-18
(800-1)x(80-1)
展开运算就好
展开运算就好
第3个回答 2016-11-18
(800-1)x(80-1)=800x80-800x1 -80x1+1=64000-800-80+1=63121
第4个回答 2016-11-18
799×79
=(800-1)×79
=800×79-1×79
=800×(80-1)-79
=800×80-800×1-79
=64000-800-80+1
=63200-80+1
=63121
=(800-1)×79
=800×79-1×79
=800×(80-1)-79
=800×80-800×1-79
=64000-800-80+1
=63200-80+1
=63121