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    [23+15*8-17]*24+18/6
    [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[7]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
    [[[[[[[[[[5]]]]]]]]]]
    【1/3+1/5+1/7】*【1+1/3+1/5】-【1+1/3+1/5+1/7】*【1/3+1/5】;3+5+7+9+11+13+15+17
    1/【【2sqrt2】/9801*1/1*【26390*0+1103】/1】
    (1.6739+5.5-3.85*0.65505-0.9*0.75559)/0.75559
    【2sqrt2】/9801*【26390*0+1103】/1
    abs5
    0.0038×4.51×3^2+0.0174×1.5×3^2=
    0.0400×4.51×3^2+0.0965×1.5×3^2=
    (1.6739+5.5-3.85*0.72707-0.9*0.68656)/0.68656
    (1.6739+5.5-3.85*0.74899-0.9*0.66258)/0.66258
    0.0091×4.51×3.6^2+0.0188×1.875×3.6^2=
    888888888-555555555
    0.0405×4.51×3.6^2+0.0965×1.875×3.6^2=
    1+2;1+2+3;1+2+3+4;1+2+3+4+5;1+2+3+4+5+6;1+2+3+4+5+6+7;1+2+3+4+5+6+7+8;1+2+3+4+5+6+7+8+9;1+2+3+4+5+6+7+8+9+10
    15*16+16*18+33*24
    (1.6739+5.5-3.85*cos(41.4967153)-0.9*sin(41.4967153))/sin(41.4967153)
    0.2305*180
    【1/2+1/3+1/5】*30+【1/3+1/5+1/7】*105+【1/5+1/7+1/9】*315

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