(6x^2-2000)x30+600x^2=64200
    4.2X=21
    （X-1.688）*200-0.1=0.8
    （X-1.345）*300-0.1=3
    (X-1.452)*1100-0.1=4
    3x^4+4x^3+4x^2-1=0
    641.5＝(652－70)÷x×(0.035＋0.000000234×130321)
    641.5＝(652－70)÷x×(0.35＋0.000000234×130321)
    641.5＝(652－70)÷x×(0.35＋0.000000234×(652＋70)÷2)
    (950－x)×(0.29＋0.000256×(950＋x)÷2)＝0.23×641.5
    5cosx/（x^2-1）
    14X^2-182X+560
    256(1+x)^2=4000
    2x×√x
    24-x=3/5*(32-x)
    x*(1.7-0.007x)=91.714
    (3X+2)/4=8
    3X+2/4=8
    3x+2
    3x+3

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