3.42×8+3.6×26+3.75×2+3×10+2.82×7+2.94+3.3×2+3.15+2.64
    (8594690×429.19-1.0×14.3×500×665^2×0.828×(1-0.5×0.828))/(300(665-35))
    5.34×30+8.94×3+9.3+6.9
    14.3×500×665
    （5.34×30+8.94×3+9.3+6.9）×0.3×0.6×10
    2642841040.45÷(0.8-0.55)÷(665-35)
    8594.69×1000×472.68-0.449×1.0×14.3×500×665^2
    1+1/(1400×82.83/665)×〖(10/0.8)〗^2×0.332×1.025
    482.84÷8594.69
    125+100+257.84
    8594.69×10×0.3%
    （4.85+3×9) ×0.6×0.6×67+0.6×0.6×3.4×3+0.6×0.6×4.5×4
    1.25×20×540.21
    2967.58-91.81-749.7-52.48-0.6×0.6×0.5×67
    8/1-（2/1-9/1）
    8/5-2/1-9/1
    5/8-（1/2-1/9）
    8/5-（2/1-9/1）
    8/5-2/1-3/1
    945.87+2×164.76+16

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