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.