（25.851+x）×0.85＝51.702+69.353-x
    （25.851+x）×0.85＝51.702+70.353-x
    （25.851+x）×0.85＝51.702+71.353-x
    （25.851+x）×0.85＝51.702+72.353-x
    （3.4+c）×7.92=12.06×c
    4X一10=26
    12.06× c=（3.3+c）×7.92
    5t*t-12t＝0
    4t(6-t)=72
    10000(0.018+0.042)=12500*(0.018+x)
    10000(0.018+0.042)=1250*(0.018+x)
    10000(1.8+4.2)=1250*(1.8+x)
    x^(476-0.5*x)=4.79
    (10-x)(30＋5x)＝315
    (10-x)(30＋5x)
    x²-870x+105072
    x²-920x+66667＝0
    x²-920x+105072＝0
    x²-675x+77128＝0
    810-0.81x*x=110x

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