Question

67.2-(12.63-9.04)的简便运算？

Answer 1

67.2一(12.63一9.04)
=67.2一12.63+9.04
=67+0.2一12一0.6一0.03+9+0.04
=(67+9一埋败12)+(0.2一0.6)
+(0.04一乎液旦0.03)
=64一岁扰0.4+0.01
=63.61。

Answer 2

67.2-(12.63-9.04)
=67.2-12.63+9.04
=54.57+9.04
=63.61

Answer 3

=67.2-12.63+9.04
=67.2+9.04-12.63
=76.24-12.63
=76+0.24-12-0.63
=76-12+0.24-0.63
=（团握76-12）-（0.63-0.24）
=64-（塌察庆没郑0.63+0.01-0.01-0.24）
=64-（0.64-0.01-0.24）
=64-（0.64-0.24-0.01）
=64-（0.4-0.01）
=64-0.39
=63.61