20000*2.25%
    1500-1350
    280*70%
    12.5*5+25*3
    （160+152+148+150+163+157）/6
    160+152+148+150+163+157
    1/6÷90
    90×1/6
    （6.064+1.577）/2
    （5.280+1.202）/2
    0.665478+0.315105*-0.172-0.0185*0.01+0.596132*-0.871-0.029*-0.172*0.01+0.123368*-0.172*-0.871-0.086*-0.172^2+0.005*0.01^2-0.435333*-0.871^2
    1.08672+0.00860526*-0.043+0.0225*0.01+0.06575*-0.1224-0.0145*-0.043*0.01+0.0231316*-0.043*-0.1224-0.0215*-0.043^2+0.005* 0.01^2-0.0612188*-0.12243^2
    2/15乘4/5加2/15除5
    (1/cos60)/2
    -2/3×ln√2/2
    -3/2×ln√2/2
    √（20+4√10）
    6290*6.14
    arctan0.5=
    tan(0.5)=

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