几道有理数的算术题.【1】(-19)-(-21)+(-2)-(+30)【2】(-7)-(+31)-(-3)+(-25)【3】(+31)+(-21)-(-5)+(-10)【4】(-52)-(-31)+(-13)-(-5)【5】(-9)-(-10)
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![几道有理数的算术题.【1】(-19)-(-21)+(-2)-(+30)【2】(-7)-(+31)-(-3)+(-25)【3】(+31)+(-21)-(-5)+(-10)【4】(-52)-(-31)+(-13)-(-5)【5】(-9)-(-10)](/uploads/image/z/6853230-54-0.jpg?t=%E5%87%A0%E9%81%93%E6%9C%89%E7%90%86%E6%95%B0%E7%9A%84%E7%AE%97%E6%9C%AF%E9%A2%98.%E3%80%901%E3%80%91%EF%BC%88-19%EF%BC%89-%EF%BC%88-21%EF%BC%89%EF%BC%8B%EF%BC%88-2%EF%BC%89-%EF%BC%88%EF%BC%8B30%EF%BC%89%E3%80%902%E3%80%91%EF%BC%88-7%EF%BC%89-%EF%BC%88%EF%BC%8B31%EF%BC%89-%EF%BC%88-3%EF%BC%89%EF%BC%8B%EF%BC%88-25%EF%BC%89%E3%80%903%E3%80%91%EF%BC%88%EF%BC%8B31%EF%BC%89%EF%BC%8B%EF%BC%88-21%EF%BC%89-%EF%BC%88-5%EF%BC%89%EF%BC%8B%EF%BC%88-10%EF%BC%89%E3%80%904%E3%80%91%EF%BC%88-52%EF%BC%89-%EF%BC%88-31%EF%BC%89%EF%BC%8B%EF%BC%88-13%EF%BC%89-%EF%BC%88-5%EF%BC%89%E3%80%905%E3%80%91%EF%BC%88-9%EF%BC%89-%EF%BC%88-10%EF%BC%89)
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