999.9*0.28+0.6666*80 简便计算
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999.9*0.28+0.6666*80 简便计算
=333.3*3*0.28+333.3*0.002*80
=333.3*0.84+333.3*0.16
=333.3*(0.84+0.16)
=333.3*2
=333.3
=333.3*0.84+333.3*0.16
=333.3*(0.84+0.16)
=333.3*2
=333.3