2.8*(1.2/0.3-0.58)+15.8*0.28=?简便方法
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2.8*(1.2/0.3-0.58)+15.8*0.28=?简便方法
![2.8*(1.2/0.3-0.58)+15.8*0.28=?简便方法](/uploads/image/z/969329-65-9.jpg?t=2.8%2A%281.2%2F0.3-0.58%29%2B15.8%2A0.28%3D%3F%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
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
=2.8*(4-0.58)+1.58*2.8
=2.8*(4-0.58+1.58)
=2.8*(4+1)
=2.8*5
=14