4x+3=42+1
    2a-a
    x*(x-1)*(x-2)*(x-3)*(x-4)=0
    15x（40÷2－x）＝1125
    4：3x＝4：9
    tanxX=3/17
    30*（1+x）=39
    （1+x）^6=1.0325
    1063.65×10^6=13.8×1500x×(990-x/2)
    31×e∧（-2÷x）-20×e∧（-6÷x）-11=0
    1826.24×10^6=13.8×1500x×(1179-x/2)
    2x+(20-x)+ 2(x-3)+5=49
    4.5+2x=11.5
    (160+393.5)/29*x+145/29*(x+15)+87/29(x+30)=1148
    5m/4-3m*sqrt(m)/[4m/9+4*sqrt(m)/3]-m/[4m/9+4*sqrt(m)/3]+m^2/[16m^2/81+32m*sqrt(m)/27+16m/9]=0
    30x^4-17x^3-228x^2+17x+30=0
    x/30+x=6%
    {（2500-x）/2500}*100=1.2%
    X*0.101263=X/9.8753
    1/3-1/10*(100-x)=16

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