arc sin(1/10)
    2.03-1.89
    【1+(65-(65-7）/65)】/2*100%
    【1+(65-(65-7）/65)/2*100%
    672/46 567/22 403/15
    333/19 844/32 666/18 972/36 900/18 888/24 972/46 567/22 403/15
    1/1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11
    0.|1+0.|2+0.|3
    891/81 424/24 795/25 735/49 930/66
    968/18
    229/325
    262.8×0.3×[（3.14×0.457²/4）×12-3.14×8.8×10-3×0.457×78.5-0]+0.18×3.14×0.457×262.8
    80×0.3×[（3.14×0.232²/4）×12-3.14×16×10-3×0.232×25-0]+0.18×3.14×0.232×80=
    80×0.3×[（3.14×0.232²/4）×12-3.14×16×10-3×0.232×78-0]+0.18×3.14×0.232×80=
    80×0.3×[（3.14×0.232²/4）×12-3.14×16×10-3×0.232×65-0]+0.18×3.14×0.232×80=
    80×0.3×[（3.14×0.232²/4）×12-3.14×16×10-3×0.232×35-0]+0.18×3.14×0.232×80=
    1.14+5.14
    √(4^2+6^2)
    -0.1002/-0.1075
    34591*0.26

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