急0.72*0.58+0.28*0.38=?简便计算
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![急0.72*0.58+0.28*0.38=?简便计算](/uploads/image/z/101213-53-3.jpg?t=%E6%80%A50.72%2A0.58%2B0.28%2A0.38%3D%3F%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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急0.72*0.58+0.28*0.38=?简便计算
急0.72*0.58+0.28*0.38=?简便计算
急0.72*0.58+0.28*0.38=?简便计算
0.72*0.58+0.28*0.38
=(1-0.28)*0.58+0.28*0.38
=0.58-0.28*0.58+0.28*0.38
=0.58-0.28*(0.58-0.38)
=0.58-0.28*0.2
=0.58-0.056
=0.524
0.72*0.58+0.28*0.38
=(1-0.28)*0.58+0.28*0.38
=0.58-0.28*0.58+0.28*0.38
=0.58-0.28*0.2
=0.58-0.56
=0.02