如题所述
第1个回答 2019-05-17
18.72-(6.72+ 5.49)
=18.72-6.72-5.49
=12-5.49
=6.51本回答被网友采纳
=18.72-6.72-5.49
=12-5.49
=6.51本回答被网友采纳
第2个回答 2019-05-17
725乘72的简便运算
=725×70+725×2
=50750+1450
=52200
=725×70+725×2
=50750+1450
=52200
