（0.994-0.769）*100+（0.994-x）*200+（0.818-0.799）*300+（0.819-0.799）*300+0.1+0.1+0.2+0.2=（0.994-0.769）*300+0.1
    （0.994-0.769）*100+（0.994-x）*200+（0.818-0.790）*300+（0.819-0.790）*300+0.1+0.1+0.2+0.2=（0.994-0.769）*300+0.1
    xsin1/x^2
    x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+1=1
    1/3(x-1)+1/4(x-1/2)=1/3(x-2)-1/4(x-1)
    ((1+0.11)^2)*(1+r) =(1+0.12)^3
    (1+0.10)(1+r)=(1+0.11)^2
    x÷(0.1-2*x)∧2÷(0.025-x)＝1.26*10∧26
    x^0.67=7.511
    e3x=2
    x=5
    12x^3-7x^2-12x-9=0
    x^2-(6/5)*x+3/10=0
    (85%×160)x+6(85%×60)=100+(75%×160)x+(75%×60)6
    10×8+8×70%(x-10)=164
    15*x^2-179*x-60=0
    （1000-140）*10+（1000-220）*（x-10）=800x
    0.26=（（0.021*x^1.85+128）^0.5）*x^0.84
    0.026=（（0.021*x^1.85+128）^0.5）*x^0.84
    1.692=（（0.021*x^1.85+128）^0.5）*x^0.84

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