(1500+2400+2390+2390+2390)/5
    5/12×1/6+7/12
    6.426+0.9×（1.794+10.956）=
    -10.068-0.9×（2.81+32.441）
    8.331+0.9×（2.462+9.203）=
    -13.052-0.9×（2.81+32.441）=
    1339.115+230.036=
    1/0.071
    1/0.562
    7.09/0.071*0.01
    1/14.1
    1/1.78
    50/7.09
    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

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