集合A={x丨(x-1)(x+2)≤0},B={x丨x<0}则A∪BA(负无穷,0] B(-无穷,1] C[1,2] D[1,正无穷)

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集合A={x丨(x-1)(x+2)≤0},B={x丨x<0}则A∪BA(负无穷,0]B(-无穷,1]C[1,2]D[1,正无穷)集合A={x丨(x-1)(x+2)≤0},B={x丨x<0}则A∪BA(

集合A={x丨(x-1)(x+2)≤0},B={x丨x<0}则A∪BA(负无穷,0] B(-无穷,1] C[1,2] D[1,正无穷)
集合A={x丨(x-1)(x+2)≤0},B={x丨x<0}则A∪B
A(负无穷,0] B(-无穷,1] C[1,2] D[1,正无穷)

集合A={x丨(x-1)(x+2)≤0},B={x丨x<0}则A∪BA(负无穷,0] B(-无穷,1] C[1,2] D[1,正无穷)
A是-2≤x≤1
B是x<0
所以并集是x≤1
选B

选B,[-2,1]U(-无穷,0)