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A 举例: 已知: A1=40+1,A2=20#0,A3=5950 极值法: 高A=A0=0.5+17 +0.2 按对称公差计算:b.2+0.1-(-0.4)=0.7 EIA=EIA1+EIA2-ESA3=0.1+0-(-0.1)=0.2 0=05+07 A 0.2 A=A1+A2-A3=4015+2005-59252=095 A 3 T=√0.12+0.12+0.32≈0.332 0 ∴A0=0.95±0.17=0.5+0.28A 59.5 59.25 0.15 A 20 20.05 0.05 A 40 40.15 0.05 0.1 3 0.4 0.1 2 0 0.2 1 0.1 = =  = =  = =  − − + + + A0=A1+A2-A3=40+20-59.5=0.5 ESA0=ESA1+ESA2-EIA3=0.2+0.1-(-0.4)=0.7 EIA0=EIA1+EIA2-ESA3=0.1+0-(-0.1)=0.2 0.7 0 5 0.2 A 0. +  = + 举例: 已知: 0.1 3 0.4 0.1 2 0 0.2 1 0.1 A 40 , A 20 , A 59.5 − − + + = + = = 极值法: 概率法: 按对称公差计算: A0 = A1 + A2 − A3 = 40.15 + 20.05 − 59.25 = 0.95 T 0.1 0.1 0.3 0.332 2 2 2 0 = + +  0.6 2 0 5 0.2 8 A 0.95 0.17 0. +  =  = + 0.7 0 5 0.2 A 0. +  = +
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