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float64 类型的值上。addfaddf 求和addf 1.5 2 25.5add1fadd1f +1add1f 1.52.5subfsubf 进行减法subf 7.5 2 37.5 - 2 - 3,将返回 2.5divfdivf 进行除法。divf 10 2 410 / 2 / 4,将返回 1.25mulfmulf 进行乘法mulf 1.5 2 26maxfmaxf 1 2.5 33minfminf 1.5 2 31.5floorfloor 123.9999123.0ceilceil 123.001124.0roundround 1234.555555555 61234.555556