X-0-29700-1980-5.3%X=72670
    X×12+1.5%X=129374
    X-0-29700-1980-5.3%X=90837
    X×12+1.5%X=6037
    X-0-1386-92-5.3%X=4239
    450➗X-450➗（X+5）=1
    4x^4-51x^3+21x^2+1=0
    x/100=（x-100）/60
    0.176x+1.8x^0.4=313.714
    X-(X/300)*40=699
    X-(X/300)*40=1498
    X-(X/300)*40=1458
    X-(X/300)*40=1398
    X-(X/300)*40=1358
    X-(X/300)*40=1418
    tanx=0.318
    （1-x）^3 = 0.9
    （1+x）^3 = 0.9
    x²-110x+2000
    -2x²+220x-4800=800

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