4042*252+2021
    505/2
    sqrt(-9)=
    tan90
    tan0
    576+49
    24^2
    3+2
    1070/(1+10%)2+70/(1+10%)
    2/2(sqrt25)5^2+(1/3)5^3
    0.6×lg（0.6）×0.5％÷0.434
    0.023 0.626/0.02 (13710.3)^0.8 (4.725)^0.4
    -lg0.0009
    -lg0.52
    -lg0.65
    -lg0.068
    -lg0.48
    -lg48
    -lg48％
    （145-43）/2*（44+145）

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