19.74=（（0.021*x^1.85+666）^0.5）*x^0.84
    x*(1+120%)=2.46
    205.5/28*x+280/28*(x+15)+56/28(x+30)=635
    x*10%+(1-x)*8%=9.4%
    (172+206)/28*x+241/28*(x+15)+112/28(x+30)=1867
    200=（20+5）x
    w^4 *（w^2+1）*（100w^2+1）=40000
    256w^4+68w^2+1=4
    1+1=x
    5^x=10x+5
    x×lnx
    3x^2-55x+36
    X∧X-42X-6
    x+1=0
    (110-x)(10+x)=3500
    25+x＝32.5+146.106-x
    x*10%+ (1-x)*8%=9.4%
    （94194-1.1X）*12/25*0.9=10X
    x+30=6
    3-2（x+1）=2（x-3）

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