内容正文:
第1章 因式分解
章末复习
体验中考
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考点1 运用提公因式法或公式法因式分解
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1.(浙江杭州中考)分解因式:4a2-1=( )
A. (2a-1)(2a+1) B. (a-2)(a+2)
C. (a-4)(a+1) D. (4a-1)(a+1)
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2. (株洲中考)分解因式:x2-2x+1=________.
(x-1)2
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3.(甘肃临夏州中考)因式分解:x2-=________________.
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4.(山东枣庄中考)因式分解:x2y+2xy=__________.
xy(x+2)
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5.(四川遂宁中考)分解因式:ab+4a=___________.
a(b+4)
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6.(江苏常州中考)分解因式:x2-4xy+4y2=___________.
(x-2y)2
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7.(湖北黄石中考)因式分解:x(y-1)+4(1-y)=____________.
(y-1)(x-4)
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8.(四川广元中考)分解因式:(a+1)2-4a=________.
(a-1)2
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9.(山东威海中考)因式分解:(x+2)(x+4)+1=________.
(x+3)2
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10.(湖北恩施州中考)因式分解:x(x-2)+1=________.
(x-1)2
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11.(黑龙江绥化中考)因式分解:x2+xy-xz-yz=______________.
(x+y)(x-z)
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12.(云南中考)分解因式:a3-9a=( )
A. a(a-3)(a+3) B. a(a2+9)
C. (a-3)(a+3) D. a2(a-9)
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考点2 综合运用提公因式法及公式法因式分解
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13.(益阳中考)下列因式分解正确的是( )
A. 2a2-4a+2=2(a-1)2
B. a2+ab+a=a(a+b)
C. 4a2-b2=(4a+b)(4a-b)
D. a3b-ab3=ab(a-b)2
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14.(山东济宁中考)下列各式从左边到右边的变形,因式分解正确的是( )
A. (a+3)2=a2+6a+9
B. a2-4a+4=a(a-4)+4
C. 5ax2-5ay2=5a(x+y)(x-y)
D. a2-2a-8=(a-2)(a+4)
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15.(甘肃武威中考)因式分解:2x2-8=____________________.
2(x+2)·(x-2)
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16.(北京中考)分解因式:x3-25x=_______________.
x(x+5)(x-5)
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17.(江苏扬州中考)分解因式:2a2-4a+2=______________.
2(a-1)2
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18.(黑龙江绥化中考)分解因式:2mx2-8my2=__________________.
2m(x+2y)(x-2y)
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19.(内蒙古呼伦贝尔中考)分解因式:a+2ab+ab2=_______________.
a(1+b)2
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20. (广西中考)如果a+b=3,ab=1,那么a3b+2a2b2+ab3的值为( )
A. 0 B. 1 C. 4 D. 9
考点3 因式分解的运用
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21. (河北中考)若k为任意整数,则(2k+3)2-4k2的值总能( )
A.被2整除 B.被3整除
C.被5整除 D.被7整除
B
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22.(山东淄博中考)若多项式4x2-mxy+9y2能用完全平方公式因式分解,则m的值是________.
±12
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23.(四川凉山州中考)已知a2-b2=12,且a-b=-2,则a+b=________.
-6
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24.(江苏徐州中考)若mn=2,m-n=1,则代数式m2n-mn2的值是________.
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25.(山东济宁中考)已知实数m满足m2-m-1=0,则2m3-3m2-m+9=________.
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