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    808.3×0.99
    (0.7+0.7+3.3)*0.2*(0.4-0.1)= (0.7+0.7+3.3)*0.2*(0.4-0.1)= (4.2+0.2)*0.2*(0.4-0.1)= (0.7+0.7+3.3)*0.2*(0.4-0.1)= 4.2*0.2*(0.4-0.1)= 2.5*0.2*(0.3-0.1)= (0.3+0.6+2.5)*0.2*(0.4-0.1)= 2.5*0.2*(0.4-0.1)= (1.7+0.7)*0.2*(0.55-0.1)= 4.2*0.2*(0.4-0.1)= (0.7+0.7+3.3)*0.2*(0.55-0.1)= (0.3+0.6+2.5)*(0.2*10.4-0.1)= (6*0.2*10.4-0.1)= 4.2*(0.2*10.4-0.1)= (0.7+0.7+3.3)*0.2*(0.4-0.1)= 4.2*0.2*(0.4-0.1)= 3.5*0.2*(0.5-0.1)= 4.2*0.2*(0.4-0.1)=
    50505.3-50000.3=
    50505.3×0.99
    2693.7-2666.8
    2693.7×0.99
    67340.3-66666.9
    67340.3×0.99
    331.7-328.4
    (0.1+0.2*(0.4-0.1)*2)*0.2*(3.3-0.5)*24= (0.1+0.2*(0.4-0.1)*3)*0.2*(3.3-0.5)*24= [(0.2+0.2*(0.4-0.1))*0.2+0.1*0.2*(0.4-0.1)]*(3.1-0.5)*6= [(0.2+0.2*(0.4-0.1)*2)*0.2+0.1*0.2*(0.4-0.1)]*(3.1-0.5)*12=
    331.7×0.99
    1224.6-1212.4
    1224.6×0.99
    816.5-808.3
    0.3*0.6*3.3*8= 0.3*0.6*3.3*4= 0.4*0.6*3.3*4=
    816.5×0.99
    51015.5-50505.3
    (1.6+4.2*0.2)*(3.5+3.5+0.2)*0.12
    51015.5×0.99
    (1.6+0.2)*(3.5*3+4.2*2+0.2)*0.12=

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