算术里的交换律,在日常生活中不能乱用.喂猪的饲养员知道,给猪开饭的时候。要先喂粗饲料,后加精饲料,让它越吃越香,才能吃得饱,睡得好,长得快.交换律在这里不成立.有些事,它们的顺序是根本不能交换的.先穿袜子,后穿鞋,很 The commutative law in mathematics cannot be used in everyday life. The breeder who feeds pigs knows that when the pig is opened for dinner. It is necessary to feed roughage first, then concentrate, so that it will eat more and more fragrant, in order to eat enough, sleep well, grow faster. exchange law is not established here. Some things, their order is simply not exchangeable. Socks, after wearing shoes, very