874-(457-126)怎么简便计算?
问题描述:
874-(457-126)怎么简便计算?
答
874-(457-126)
=874-457+126
=(874+126)-457
=1000-457
=543
答
874-(457-126)
=874-457+126
=874+126-457
= 1000-457
=543