360/x*（x+3）=495
    tan2x
    35+8L-L²=35+16L-3L²
    1.01^x=1000*0.99^x
    1.01^x=10*0.99^x
    2x²＋x²＝4
    (-0.0008x^3)+(0.009x^2)-(0.0398x)+0.0483=0
    (2/5)*a=sina
    3123.2x^0.76+24791.4x^0.01643=28300
    5883.4x^0.5753+21569.4x^0.05832=28000
    20956.2x^0.01954+3975.5x^0.7399=25300
    9255.1x^0.3845+17633.8x^0.1443=27600
    14178.7x^0.2514+12215.1x^0.2486=27200
    (1+x)x=1
    15262.8x^0.1395+10621.2x^0.3925=26700
    6762.6×x＾0.5809+18568.7×x＾0.05654=25900
    2x 2+ 25x - 50 = 0
    2x²+ 25x - 50 = 0
    (0.5+x)(0.5+4x)^4=(0.5-2x)^2(0.5-2x)^2
    ( 15 + 2x ) ( 10 + 2x ) = 15 × 10 × 5/3

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