1000000=500Q-（6000000+250Q）
    1000000=500*x-（6000000+250*x
    2x - 4(10-x)=8
    4(20-x) - 2x =8
    10.2×7.3+898×0.73
    8.25×43+0.0825×2100+825×0.36
    15 × 4.8 + (19 - 15) × 6.9
    42 × 5.18 - 38 × 5.36
    2 × 160.50 + 189.90
    3.42×99.8
    2.5×32.4
    0.125×0.88
    12.5×0.064
    0.4 × 1.25 × 25 × 0.8
    89.2 × 0.05 × 0.02
    26×12.5×0.8
    0.867×2.5×4
    （175+5）*600*80%*5%
    Xx0.15=2000
    0.15x=2000

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