如题所述
第1个回答 2019-03-12
101x19+101x80-99的简便方法运算
=101x(19+80)-99
=101x99-99
=(101-1)x99
=100x99
=9900
=101x(19+80)-99
=101x99-99
=(101-1)x99
=100x99
=9900
第2个回答 2019-03-12
9900
第3个回答 2019-03-12
101x19
100*19+19
=1900+19
=1919
101x80-99
100x80+20-99
=8000+20-100-1
=8020-100-1
=7920-1
=7919
100*19+19
=1900+19
=1919
101x80-99
100x80+20-99
=8000+20-100-1
=8020-100-1
=7920-1
=7919