7/5y-4/5y=-4+9
    1/k²-3+2（k+1）=7
    6k²-4k-10=0
    k^2+8k+7=0
    20000I²-600I+9=0
    x+x*6%=103882.82
    8x^2-300x-1400=0
    X+X*6%=229236.46
    x^4-4x^2-2x-1=0
    X+0.01X*47=470
    X+1.01X*47=470
    1.5x*8+1.2x*2-10x=1.5x*10-10x-390
    arctan-2=x
    11800（1+x）+13240（1+x）^2=20000
    arctan2=x
    75962x-2866x-225.78x-4709.02=17040
    x∧4—7x∧3—5x—1＝0
    8.96×77.11+0.18x=（77.11+x）×7.97
    8.96x+0.18×9.6=（9.6+x）×8.04
    8.96x+0.18×9.5=（9.5+x）×8.04

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