(1)(-1)-2+(π-23)0-(-12)-1(2)已知:a+1a=3,求a
题型:解答题
问题:
(1)(-1)-2+(π-23)0-(-
(2)已知:a+
(3)(9x3y2-6x2y+3xy2)÷(-3xy); (4)先化简再求值:(m+1)2-5(m+1)(m-1)+3(m-1)2,其中m=-
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(1)(-1)-2+(π-23)0-(-
(2)已知:a+
(3)(9x3y2-6x2y+3xy2)÷(-3xy); (4)先化简再求值:(m+1)2-5(m+1)(m-1)+3(m-1)2,其中m=-
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