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0.8*(3.2–2.99/2.3)简便计算

=0.8[3.2-(2.3+0.69)/2.3] =0.8(3.2-1-0.3) =0.8(2.2-0.2-0.1) =0.8(2-0.1) =0.8×2-0.8×0.1 =1.6-0.08 =1.52

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