问题描述:
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(1.)x²-5x+6=______
(2.)z²+6z-7=______
(3)2x²-7x+3=_____
(4)2m²+mn-n²=______
(5)-x²+3x-2______
(6)x的4次方-x²-12________
(1.)x²-5x+6=______
(2.)z²+6z-7=______
(3)2x²-7x+3=_____
(4)2m²+mn-n²=______
(5)-x²+3x-2______
(6)x的4次方-x²-12________
问题解答:
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