7.09*7.9
    5.3/96
    20*265
    18.55*100/(2*23+12+3*16)
    70*0.265
    (2*23+12+3*16/100)
    11.1/60
    40*0.265
    [212648.529+49.5%*(212648.529-198881.040)]*8.25%
    [117162.820+47.5%×(117162.820-110862.675)]×6.25%
    sqrt【sqrt【289】-1】
    0.06*0.06+0.36*0.36+2.16*2.16
     85*97+44*53+68*53 ；78*53+44*49
    9+99+999+9999+99999；【2+4+6+8+10+12+14+16+18+20+22】-【1+3+5+7+9+11+13+15+17+19+21】；123456789+987654321-111111110
    108×7/10
    5*5-1.4*1.4
    5*5-2.4*2.4
    5*5-3.6*3.6
    6*6-3.6*3.6
    sqrt（5+2sqrt（5）+1+4

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