sin x*tan x
    x*x*x=1.728
    700+（1+x）^2=1008
    (X-3)2+4X(X-3)=0
    -1/12(-2-x)^2+3=2.25
    2sinx+cos2x
    (4136.8+2.8782×10^10/（361^0.5×x×（x+80.3706））)×（x-80.3706）＝8314.73×361
    (4136.8+9.4749×10^9/（361^0.5×x×（x+49.9925））)×（x-49.9925）＝8314.73×361
    8X-24/25X-40=4/1
    (4136.8+9.4749×10^9/（361^0.5×v×（v+49.9925））)×（v-49.9925）＝8314.73×361
    (4136.8+9.4749×10^7/（361^0.5×v×（v+49.9925））)×（v-49.9925）＝8314.73×361
    2x∧3-x∧2-1
    (275+y*6.9)*1.25=3000
    x÷e^x
    (2/2.05)^x=133/101000
    (40/41)^x=133/101000
    (400/401)^x=133/101000
    x-2=0
    73-x*0.6=9
    73-x*0.6=104

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