摘要:13.下列各式中能用平方差公式分解因式的是 A.4x2+y2 B.-x2-25y2 C.y6-y3 D.(x-y)2-9 0 4 -2 14.如图所示 则不等式组的解集是 A.x>-2 B.x<4 C.-2 < x <4 D.无解
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