169×68-69×69怎样简便运算

2024-11-16 11:44:26
推荐回答(3个)
回答1:

回答2:

169×68-69×69
=(100+69)×68-69×69
=6800+68×69-69×69
=6800-(69-68)×69
=6800-69
=6731

回答3:

169×68-69×69
=(100+69)68-69×69
=6800+68×69-69×69
=6800+(68-69)×69
=6800-69
=6731