4.2×10^3*500×20
    0.504÷1.68
    4.2×10^3*15×80
    4.2×10^3*15×20
    4.2×10^7*0.4
    2000×6900
    6.9/((5+45/60)/60)
    6.9/23*240
    (23/4)/60+0/1
    45/60+0
    45/60
    5.75/60
    (5+45/60)
    (5+45/60)/60
    3.36÷4.2
    4.2×10^3*40×20
    50%*70%*80%
    0.15×4×10^7*52.5%
    30×25×4.2×10^3
    2*3.7+3.7+12+12+8+4+8+4+12+12+7.4+3.7*3+3.7+3.7+3.7+3.7+8+8+8+3.7*4+3*3.7

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