问题 解答题

76×65-65×54+54×43-43×32+32×21-21×10.

答案

76×65-65×54+54×43-43×32+32×21-21×10,

=(76×65-65×54)+(54×43-43×32)+(32×21-21×10),

=65×(76-54)+43×(54-32)+21×(32-10),

=65×22+43×22+21×22,

=22×(65+43+21),

=22×129,

=20×129+2×129,

=2580+258,

=2838.

单项选择题 A1型题
问答题 简答题