1.若a=-4,则-(-a)=______;若-y=3.1,则y=______.2.若m+2的相反数是-7,则m=_______.
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![1.若a=-4,则-(-a)=______;若-y=3.1,则y=______.2.若m+2的相反数是-7,则m=_______.](/uploads/image/z/3582880-16-0.jpg?t=1.%E8%8B%A5a%3D-4%2C%E5%88%99-%EF%BC%88-a%EF%BC%89%3D______%EF%BC%9B%E8%8B%A5-y%3D3.1%2C%E5%88%99y%3D______.2.%E8%8B%A5m%2B2%E7%9A%84%E7%9B%B8%E5%8F%8D%E6%95%B0%E6%98%AF-7%2C%E5%88%99m%3D_______.)
1.若a=-4,则-(-a)=______;若-y=3.1,则y=______.2.若m+2的相反数是-7,则m=_______.
1.若a=-4,则-(-a)=______;若-y=3.1,则y=______.2.若m+2的相反数是-7,则m=_______.
1.若a=-4,则-(-a)=______;若-y=3.1,则y=______.2.若m+2的相反数是-7,则m=_______.
若a=-4,则-(-a)=___-4___;若-y=3.1,则y=___-3.1___.2.若m+2的相反数是-7,则m=___5____.