2.5*0.2*(0.3-0.1)
    2.5*0.2*(0.4-0.1)
    68705.8-68362.3
    1.4*0.2*(0.4-0.1)
    2.5*0.2*(0.5-0.1)
    68705.8×0.995
    （0.1*0.1+0.06*0.1*3）*3.4*4
    （0.1*0.1+0.06*0.1*3）*3.4*12
    （0.1*0.1+0.1*0.2+0.6*0.2*3+0.6*0.1*2）*3.4*24
    （0.1*0.1+0.06*0.1*3）*3.4*6
    338.5-335.1
    338.5×0.99
    1249.4-1236.9=
    (0.2*0.1+0.06*0.2*3)*(3.4-0.12)*3*4
    1249.4×0.99
    833.0-824.7
    【（269-80）-161.4】÷189×100%
    833.0×0.99
    [（3.4-0.12）*（0.2*0.2）+（0.5*0.06*0.2*(3.4-0.12)*3]
    52049.9-51529.4=

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