x2＾x=1
    2＾0.464
    4456*14+26808
    (5-2x)(4-2x)
    x*10%=586.7
    x+50*8*0.2%+x*1.5%+x*10%+(x+x*10%)=586.7
    (x+50*0.2%+x*1.5%+x*10%)+(x+x*10%)=586.7
    (x+400*0.2%+x*1.5%+x*10%)+(x+x*10%)=586.7
    x+400*0.2%+x*1.5%=156
    (x+1)＋2(x＋1)＋3(x＋1)＋4(x＋1)=5(x＋1)+6(x-1)
    12-(3x-4)=4
    32x＋2(x-16)=36
    145-(5x＋34)=11
    8×(x＋4)=16×4
    3(x-1.8)＋4x=4.4
    27-(4x-16)=23
    2×(2x+54)=140
    0.25x^4－2x^3＋x^2＝4
    0.5*(5-2t)*0.6*(4-t)
    4.24×1.71＋424×0.0552＋72.3×0.576

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