48÷12
    178-87.21+ 43221+531921 -12.79
    15 ×（- 5）÷（- 15 ）× 5
    2÷（-3/7）×4/7÷（-5 1/7）[15 1/2-114 ÷125 + 3 12 ]÷（-118 ）
    (-7/18)×3/7×2.4
    (-1/6-3/20+4/5-7/12)×（-15×4）
    141550622-56202-0014-4-0150-32-04--0124
    tan(1.2)
    cos(0.75)
    1019607.84+35%*65%*1019607.84=
    160000*(1-35%)/10.2%=
    arctan5-arctan40-arctan0.05-arctan0.5-90
    arctan8.2*0.249-arctan8.2-arctan0.82-arctan0.06*8.2
    arctan3.6
    (0.092+1.36*0.00435*1.052)/(0.126*1.318)
    0.092+1.36*0.00435*1.052/(0.126*1.318)
    (550000+365000)/(175000+150000/4)=
    (550000+365000)/(175000+150000/(26/12))=
    (550000+365000)/(175000+150000/2)=
    (1.51-0.82+0.98-1.76+1.04-2.41+(-0.81)-(-0.92)+1.31-0.88+2.88-1.91)/3=

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