0.577=x/2-ln(1+x)
    8x+2+4=9x
    6x+3+5=8x
    （x-9）×（x+1）∧2/3
    X*0.916+X*0.21*0.1479=3500.29
    √3-h+√4-h=8-3
    x²-30x+105=0
    x²-30x+105=0
    3-h+4-h=8-3
    0.21x^2+1.25x-0.84＝0
    x/(1-x)+ln(1-x)-1=0
    3-h+4-h=5
    0.5^x+0.75^x=1
    x^2-10.98*x=531.13
    x^2-11.849*x=540.36
    x^2-8.09*x=201.24
    x^2-5.472*x=136.152
    x^2-8.63*x=202.49
    x^2-15.49*x=267.82
    16496/（21.75x8）×200%×（25x7.5）=

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