(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.
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(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.
![(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.](/uploads/image/z/4251234-66-4.jpg?t=%EF%BC%88-19.5%2B2.76%EF%BC%89-%EF%BC%882.76%2B3.5%EF%BC%89%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%EF%BC%9B-%E3%80%90%2B%EF%BC%88-2%EF%BC%89%E3%80%91-%E3%80%90%2B%EF%BC%88-4%EF%BC%89%E3%80%91%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91.)
(-19.5+2.76)-(2.76+3.5)=-19.5+2.76-2.76-3.5=-19.5-3.5=-23 -【+(-2)】-【+(-4)】=2+4=6
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