140*3.5964+3.6*3+4*2=(140+3+2)*x
    5000000*（1-2.06%）-（5000000*（1-2.06%）/1.09*0.09-x/1.09*0.09）*1.12 -454809.6= x
    5000000*（1-2.06%）-（5000000*（1-2.06%）/1.09*0.09-x/1.09*0.09）*1.12=x
    100x+100x^2=150
    152x+152x^2=218.8
    1633-9212x+9604x^2=0
    16-4x=x-20
    2^x/2^x+1
    (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

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