(7.7+15.4)/0.7-10.9
    7.6*27+7.6*174-7.6
    8.78-(5.78+3.3*0.3)
    8.78-(5.78+-3.3*0.3)
    3.6/[(17.5+1.22)/0.26]
    303-102/15-67
    8÷0.64-1.7*4.5
    3.75/[0.3*(1.34-0.84)]
    2.5*10.4
    5.03×[40÷(3.49一3.09)]
    0.4×3.35×25×2
    31.6÷(7.9一5.4)÷0.4
     (58.3+25.7)/(160*0.25)
    (58.3+25.7)-(160*0.25)
    6.32*0.99+6.32*0.01
    6.32×0.99+-6.32×0.01
    375*99
    1.7*((1.3+2.15)÷0.6)
    1.7*[(1.3+-2.15)÷0.6]
    6/7-(3/14+3/7)

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