950×20＝ 274×20＝ 5400÷180= 96×600＝ 280×60＝ 1900÷190= 807×50＝ 261×50＝ 3400÷170=
    100×1520/(200×1230)
    1.014+0.1608
    1.013/1.2
    1.2/1.013
    96.851/72
    71.078*48/(92%*38.29)
    2/tan108
    2tan108
    2cos108
    0.6×1.67×1.230
    696.03/(339.31×1.230)
    76.50＋(424.98－76.50)(2×7.353)/19.5
    1613.98×（1－(4×7.353 ^2)/(19.5^2 )）
    1×1×1.1×0.45×10^(-3)×200×1242*√((2+0.6×0.303)*√35×0.00201×330)+0.75×10^(-3)×330×(760+502+760+502)×0.707
    1×1×1.1×0.45×10^(-3)×200×1426√((2+0.6×0.656)√35×0.00201×250)
    1×1×1.1×0.45×10^(-3)×200×1242*√((2+0.6×0.303)*√35×0.00201×330)+0.75×10^(-3)×330×(760+502+760)×0.707
    1×1×1.1×0.45×10^(-3)×200×1242√((2+0.6×0.303) √35×0.00201×330)+0.75×10^(-3)×330×(760+502)×0.707
    1×1×1.1×0.45×10^(-3)×200×1449√((2+0.6×0.217) √35×0.00201×250)
    4.8÷0.5÷0.2

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