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    0.75*0.75*0.26*0.26+0.25*0.25*0.19*0.19+2*0.75*0.25*0.5*0.19*0.26
    0.75*0.75*0.26*0.26+0.25*0.25*0.25*0.25+2*0.75*0.25*0.3*0.25*0.26
    0.75*0.75*0.15*0.15+0.25*0.25*0.12*0.12+2*0.75*0.25*0.3*0.12*0.15
    【(7.0+0.24)×(2.9-0.45)】-1.1×1.5×2+10.24×2.45-7.89+6.22×2.45+1.52×2.3-1.04+10.24×2.45+0.5×2.45-(1.5×2+1×2.9+2.4×2)
    (9.36+8.74+7.28+6.3)×1.06
    (1.8+1.2+0.9)*0.3+(2.35+2.3+0.06+0.6)*0.3+1.3*0.6+(2.3+2.35)*1
    (3.5-0.24)×(1.35-0.18)+(0.9×2.4)
    (2.35-0.18)×(1.5-0.24)+(0.8×0.24)
    (3.5-0.24)×(2.3-0.12)+(0.9*0.12)
    (2.35+2.3+1.35-0.24)×(3.5+0.5-0.24)+(1.0+0.9)*0.24
    【(3.5-0.24)×(4-0.24)+(0.9×0.24)】×2
    (3.5-0.24+1.35-0.18)×2×2.92-(0.9×2.1×2+0.9×2.6+0.9×2.5)
    【(1.5-0.24)+(2.35-0.18) 】*2*2.92-(0.8×2+0.6*0.6)
    【 (3.5-0.24)+(2.3-0.12) 】*2*(2.92-1.0)-(1.1*1.5+0.9*2.1+0.8*2.0)
    【( (3.5-0.24)+(2.3-0.12) 】*2*2.92-1.0)-(1.1*1.5+0.9*2.1+0.8*2.0)
    (2.35+2.3+1.35-0.24+3.5+0.5-0.24)×2×2.92-(0.9×0.25+0.8×2+2.9*1+2.4×2+0.9×2.1×4)
    【(3.5-0.24)+(4-0.24)】×2×2.92-(1.1×1.5+1.5×1.5+0.9×2.1×2)+【(3.5-0.24)+(4-0.24)】×2×2.92-(1.1×1.5+1.5×2+0.9×2.1)
    (100*6^2)/(((6^2)^3+4)(-6-9))
    (8-2)/3
    4.2/40/3

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