-(1-0.7788)*300+100*0.7788
    (1-0.7788)*300+100*0.7788
    e^(-0.25)
    8*294/160+12*98/80
    8*294/160+72*98/80
    8*294/160+72*98/00
    (17482.08+3000+37178.86)/ 46354
    24×150×3.14×2.99×1.1
    662.2×1.1×2.4×10
    √((9.09×95.38)/(1000×1.57))+0.3
    √((9.09×95.38)/(1000×1.57))
    0.0151×66.32×〖9.0〗^2
    0.0249×66.32×〖7.6〗^2
    7×10×1.4-1.1×24×1.2
    7×10×1.4-1.1×24×1.2
    114514+1919810
    arctan(0.62×4.466)-arctan(0.13×4.466)-arctan(4.466)
    （3.6*3.2-0.89*1.5）*3*2
    （3.6*3.8-0.89*1.2）*3*2
    （3.9*1.2+0.8*1.2+1.2*3.8）*3*2

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