设集合A={x/x²+4x=0,x∈R},B{x/x²+2(a+1)x+a²-1=0,x∈R},若B是A的真子集,求实数a的值
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![设集合A={x/x²+4x=0,x∈R},B{x/x²+2(a+1)x+a²-1=0,x∈R},若B是A的真子集,求实数a的值](/uploads/image/z/3000566-38-6.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88A%3D%7Bx%2Fx%26%23178%3B%2B4x%3D0%2Cx%E2%88%88R%7D%2CB%7Bx%2Fx%26%23178%3B%2B2%EF%BC%88a%2B1%EF%BC%89x%2Ba%26%23178%3B-1%3D0%2Cx%E2%88%88R%7D%2C%E8%8B%A5B%E6%98%AFA%E7%9A%84%E7%9C%9F%E5%AD%90%E9%9B%86%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%80%BC)
设集合A={x/x²+4x=0,x∈R},B{x/x²+2(a+1)x+a²-1=0,x∈R},若B是A的真子集,求实数a的值
设集合A={x/x²+4x=0,x∈R},B{x/x²+2(a+1)x+a²-1=0,x∈R},若B是A的真子集,求实数a的值
设集合A={x/x²+4x=0,x∈R},B{x/x²+2(a+1)x+a²-1=0,x∈R},若B是A的真子集,求实数a的值
a为正负1或7.