2.8*(1.2/0.3-0.58)+15.8*0.28=?简便方法
问题描述:
2.8*(1.2/0.3-0.58)+15.8*0.28=?简便方法
答
2.8*(1.2/0.3-0.58)+15.8*0.28
=2.8*(4-0.58)+1.58*2.8
=2.8*(4-0.58+1.58)
=2.8*(4+1)
=2.8*5
=14