-16-3*4*（1/3-1/2）/（-1 1/3）
    -1/6+3/4-1/12
    (((3/8)-(3/4))/(1/16))+(-0.6)*(10/3)
    (((3/8)-(3/4))/16)+(-0.6)*(10/3)
    0.04×lg0.00035+0.96×lg0.0005
    0.44×lg0.00041+0.56×lg0.00064
    lg0.00069×0.04
    lg0.00043×0.96
    1008/700
    lg576
    lg2.079
    19/10
    （5，3）
    e+1
    8-1
    0.5*3.14*1.2*280*7+0.8*0.8*1.131*(550+6*(4.6*6+3.8*7+(7-4.6-3.8+2)*10/(7+2))*(7+2-3))=
    0.5*3.14*1.2*310*7+0.8*0.8*1.131*(550+6*(4.6*6+3.8*7+(7-4.6-3.8+2)*10/(7+2))*(7+2-3))=
     lg36
    0.5*3.14*1.2*310*6.036+0.8*0.8*1.131*(550+6*(4.6*6+3.8*7+(6.036-4.6-3.8+2)*10/(6.036+2))*(6.036+2-3))=
    0.5*3.14*1.2*280*6.4+0.8*0.8*1.131*(550+6*(4.6*6+3.8*7+(6.4-4.6-3.8+2)*10/(6.4+2))*(6.4+2-3))=

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