1+2-3+4+5-6+7+8-9+10+11-12+13+14-15+16+17-18+19+20-21；35-34-33+32+31-30-29+28+27-26-25+24+23-22-21+20；3+8+13+18+23+28+33；2+10+18+26+34+42+50+58；a+a*a+a*a*a+a*a*a*a=30
    21/5-(1.375-39/5)-29/8
    1*2*3*4*5*6*7*7+1*2*3*4*5*6*6+1*2*3*4*5*5+1*2*3*4*4+1*2*3*3+1*2*2+1*1；2+22+222+2222+22222+222222；1+21+321+4321+54321+654321+7654321+87654321
    77777777*99999999；1+3+5+7+10+13+15+17+19；2+4+6+8+10+12+14+16+18；48*49*50*51*52/5
    1+2+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1；【1*2*3+2*3*4+3*4*5+4*5*6+5*6*7】/3；9+99+999+9999+99999；1*2*4+2*4*8+4*8*16-2-4-8-16；8*9*111111
    (34.86*5.42+59.5*2.5+108.64*0.66)-203.24*5.89
    tan(arccos0.69)
    6.698*1.38*1.38+69.48098*1.38
    900^4÷12
    arctansqrt（2）
    (34.86*9.52+59.5*6.6+137.48*4.59+387.77*1.74)/9.99
    (34.86*9.52+59.5*6.66+137.48*4.59+387.77*1.74)/9.99
    (9.48*6+40.41*2.79+131.9*0.91+4.24*0.03)-185.81*5.8
    6.665*0.06*0.06+70.310455*0.06
    (9.48*10.19+40.41*6.98+131.9*5.1+419.2*1.92)/9.99
    1/2/[0.5-(-1.5)^2]+3/2/(3/4)*(-1/2)^3
    1/2/[0.5-(-1.5)^2]+3/2/3/4*(-1/2)^3
    （-3）^2
    (17.5*1.6+20+19.1*3.7+22*1.8+20*4.25-10*10.35)*0.333-2*20*0.577+10*10.35
    (188.36-195.69)/195.69

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