2.5*2.4/1.4+4.8/2.1*2.5
    cos10
    0.438298/.297*4.2=
    92/126-（.15+50/1650+2/45+3/44.7）=
    0.291861*2.5*126=
    0.374806/.261*4.2=
    58/87-（.15+50/1650+2/45+3/44.7）=
    0.291861*2.2*87=
    .15+50/1650+2/45+3/44.7=
    log(2,5/4)－log(3,11/9)
    log(2,5/4)
    log2 5/4 －log3 11/9
    1×0.8×7900
    1/10×(0.2×29^2-29+8)
    1/10×(0.2×16^2-16+24)
    1/10×(0.2×15^2-15+49)
    20log√10
    1/184
    (2×5.11×10-9)/(2×9)
    (130.91×16.44+8×27.88)/290.48

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