415.9÷4308.62
    204.2×21.10
    546.8÷6350.62
    204.2×31.10
    0.5852÷6207.68×1000
    0.5852÷6207.68
    25t^2+15t-4=0
    7.8÷0.3
    0.3X+5x0 .6=9
    （32-2x)(20-x) =540
    50t-5t^2=45
    50t-25t^2=45
    -71339.8/280000
    （66.3-78）*6773+3*6773-0.05*248294
    -1250000+442000/(1.11^2)+509600/(1.11^3)+400400/(1.11^4)+353600/(1.11^5)
    -1250000+442000/(1.11^2)+509600/(1.11^3)+400400/(1.11^4)+353600/(1.11^5)
    [(78-54.6)*4113-4*4113+8%*(474814-153993.73)]/153993.73
    [(78-54.6)*4113-4*4113+8%*153993.73]/153993.73
    [(78-54.6)*4,113-4*4113+8%*153993.73]/153993.73
    [(78-54.6)*4,113-4*4,113+8%*153,993.73]/153,993.73

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