简便计算:(0.39/3-0.1)/(1-2/3)

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简便计算:(0.39/3-0.1)/(1-2/3)简便计算:(0.39/3-0.1)/(1-2/3)简便计算:(0.39/3-0.1)/(1-2/3)(0.39/3-0.1)/(1-2/3)上下同乘以

简便计算:(0.39/3-0.1)/(1-2/3)
简便计算:(0.39/3-0.1)/(1-2/3)

简便计算:(0.39/3-0.1)/(1-2/3)
(0.39/3-0.1)/(1-2/3)
上下同乘以3
=3(0.39/3-0.1)/3(1-2/3)
=(0.39-0.3)/(3-2)
=0.09

(0.39/3-0.1)/(1-2/3)
(0.39/3-0.1)/(1/3)
(0.39/3-0.1)*3
0.39-0.3
0.09