(本題共兩小題,每小題6分,滿分12分)
(1)解不等式組:                  
(2)因式分解:
(1)
解:由①得 .··············································································· 2分
由②得 .··················································································· 4分
不等式組解集為.·································································· 6分
(2)解:
························································································ 2分
.·············································································· 6分
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:初中數(shù)學(xué) 來源:不詳 題型:單選題

下列計(jì)算正確的是(  )
A.B.
C.D.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:填空題

分解因式:_______________.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:填空題

(2011四川瀘州,18,3分)如圖,是用三角形擺成的圖案,擺第一層圖需要1個(gè)三角形,擺第二層圖需要3個(gè)三角形,擺第三層圖需要7個(gè)三角形,擺第四層圖需要13個(gè)三角形,擺第五層圖需要________個(gè)三角形,…,擺第n層圖需要        個(gè)三角形.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:單選題

下列計(jì)算正確的是(   )
A.B.
C.D.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:填空題

已知,則的值        

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:單選題

(11·兵團(tuán)維吾爾)下列各式中正確的是
A.(-a3)2=-a6B.(2b-5)2=4b2-25
C.(a-b)(b-a)=-(a-b)2D.a(chǎn)2+2a b+(-b)2=(a-b)2

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:單選題

(2011廣西梧州,6,3分)因式分解x2y-4y的正確結(jié)果是
A.y(x+2)(x-2)B.y(x+4)(x-4)
C.y(x2-4)D.y(x-2)2

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:不詳 題型:填空題

(2011•雅安)分解因式:x3﹣6x2+9x=   

查看答案和解析>>

同步練習(xí)冊(cè)答案