因式分解题。初二数学。5道。谢谢
\u521d\u4e8c\u6570\u5b66\u56e0\u5f0f\u5206\u89e3\u98981. \u6839\u636e\u56e0\u5f0f\u5206\u89e3\u7684\u6982\u5ff5\uff0c\u5224\u65ad\u4e0b\u5217\u5404\u7b49\u5f0f\u54ea\u4e9b\u662f\u56e0\u5f0f\u5206\u89e3\uff0c\u54ea\u4e9b\u4e0d\u662f\uff0c\u4e3a\u4ec0\u4e48\uff1f
\uff081\uff096abxy=2ab•3xy;
\uff082\uff09
\uff083\uff09\uff082x-1\uff09•2=4x-2
\uff084\uff094x2-4x+1=4x\uff08x-1\uff09+1.
2. \u586b\u7a7a
\uff081\uff09\uff082m+n\uff09\uff082m-n\uff09=4m2-n2\u6b64\u8fd0\u7b97\u5c5e\u4e8e \u3002
\uff082\uff09x2-2x+1=\uff08x-1\uff092\u6b64\u8fd0\u7b97\u5c5e\u4e8e \u3002
\uff083\uff09\u914d\u5b8c\u5168\u5e73\u65b9\u5f0f 49x2+y2+ =\uff08 -y\uff092
2. \u8ba1\u7b97\u4e0b\u5217\u5404\u5f0f\uff1a
\uff081\uff09\uff08m+4\uff09\uff08m-4\uff09= ;
\uff082\uff09\uff08y-3\uff092= \uff1b
\uff083\uff093x\uff08x-1\uff09= \uff1b
\uff084\uff09m\uff08a+b+c\uff09= .
\u6839\u636e\u4e0a\u9762\u7684\u7b97\u5f0f\u586b\u7a7a\uff1a
\uff081\uff093x2-3x=\uff08 \uff09\uff08 \uff09
\uff082\uff09m2-16=\uff08 \uff09\uff08 \uff09
\uff083\uff09ma+mb+mc=\uff08 \uff09\uff08 \uff09
\uff084\uff09y2-6y+9=\uff08 \uff09\uff08 \uff09
3. \u5c06\u4e0b\u5217\u5404\u5f0f\u5206\u89e3\u56e0\u5f0f\uff1a
3x+6\uff1b 7x2-21x\uff1b 8a3b2-12ab3c+abc\uff1b a\uff08x-3\uff09+2b\uff08x-3\uff09\uff1b 5\uff08x-y\uff093+10\uff08y-x\uff092\u3002
\u7b54\u6848\uff1a\uff081\uff093x+6=3x+3\u00d72=3\uff08x+2\uff09 \uff082\uff097x2-21x=7x•x-7x•3=7x\uff08x-3\uff09
\uff083\uff098a3b2-12ab3c+abc=ab•8a2b-ab•12b2c+ab•c=ab\uff088a2b-12b2c+c\uff09
\uff084\uff09a\uff08x-3\uff09+2b\uff08x-3\uff09=\uff08x-3\uff09\uff08a+2b\uff09
\uff085\uff095\uff08x-y\uff093+10\uff08y-x\uff092=5\uff08x-y\uff093+10[-\uff08x-y\uff09]2=5\uff08x-y\uff093+10\uff08x-y\uff092=5\uff08x-y\uff092\uff08x-y+2\uff09
4. \u628a\u4e0b\u5217\u5404\u5f0f\u5206\u89e3\u56e0\u5f0f\uff1a
\uff081\uff093x2-6xy+x \uff082\uff09-4m3+16m2-26m
6. \u628a\u4e0b\u5217\u5404\u5f0f\u5206\u89e3\u56e0\u5f0f\uff1a
\uff081\uff09 4q\uff081-p\uff093+2\uff08p-1\uff092
\uff082\uff09 3m\uff08x-y\uff09-n\uff08y-x\uff09
\uff083\uff09 m\uff085ax+ay-1\uff09-m\uff083ax-ay-1\uff09
\uff081\uff09x²-4xy+4y²-10x+20y+25
=x²-2\u00d72xy+\uff082y\uff09²-\uff0810x-20y\uff09+25
=(x-2y)²-2\u00d75\uff08x-2y)+5²
=(x-2y-5)²
(2)(n+1)(n+2)(n+3)(n+4)+1
=(n+1)(n+4)(n+2)(n+3)+1
=(n²+5n+4)(n²+5n+6)+1
=[\uff08n²+5n\uff09+4][(n²+5n)+6]
=(n²+5n)²+2\u00d75(n²+5n)+24+1
=(n²+5n)²+2\u00d75(n²+5n)+5²
=(n²+5n+5)²
（1）原式=xy(x-1)
(2)原式=(x-y)(a²-16)
=(x-y)(a+4)(a-4)
(3)原式=(-x²+y²+2xy)(-x²+y²-2xy)
(4) 原式=(x+2y+y)(x+2y-y)
=(x+3y)(x+y)
(5)原式=2a(m²-4)
=2a(m+2)(m-2)
绛旓細(5)鍘熷紡=2a(m²-4)=2a(m+2)(m-2)
绛旓細34.21x²锛31x锛22锛 35.4x²锛4xy锛媦2锛4x锛2y锛3锛 36.9x5锛35x3锛4x锛 37.3x²锛6x锛 38.49x²锛25锛 39.6x²锛13x锛5锛 40.x²锛2锛3x锛 41.12x²锛23x锛24锛 42.(x锛6)(x锛6)锛(x锛6)锛 43.3(x锛2)(x锛5)锛(x锛2)(...
绛旓細1.X鐨勫钩鏂-4 =(x+2)(x-2)2.9-Y鐨勫钩鏂=(3+y)(3-y)3.1-a鐨勫钩鏂=(1+a)(1-a)4.4X鐨勫钩鏂-Y鐨勫钩鏂=(2x+y)(2x-y)5.a鐨勫钩鏂-9鍒嗕箣涓X鐨勫钩鏂=(a+1/3x)(a-1/3x)6.36-m鐨勫钩鏂=(6+m)(6-m)7.4X鐨勫钩鏂-9Y鐨勫钩鏂=(3x+2y)(3x-2y)8.0.81a鐨勫钩鏂-16b=(0.9a+4b...
绛旓細=(x+y)²(x-y)² 涓や釜鎷彿鍐呭垎鍒敤瀹屽叏骞虫柟鍏紡 (5)5mx²-10mxy+5my²=5m(x²-2xy+y²) 鎻愬彇5m =5m(x-y)² 鍚庨潰鎷彿鍐呯敤瀹屽叏骞虫柟鍏紡
绛旓細鍥炵瓟锛氭槸鍒濅簩鐨?
绛旓細=(3(a-b))+2*3*2(a+b)(a-b)+(2(a+b))²=(3(a-b)+2(a+b))²=(5a-b)²a³-10a²+25a =a(a²-2*5*a+5²)=a(a-5)²x²+2x+1-y²=(x+1)²-y²=(x+1+y)(x+1-y)25锛坢+n-3锛²-...
绛旓細2.=3(x^2-1)=3(x-1)(x+1)3.=x(x^2-1)=x(x-1)(x+1)4.=a(a^2+4a+4)=a(a+2)^2 5.=a(a+x+1)6.=-4x(x^2+4x+6)7.=(3a)^4-(2b)^4=[(3a)^2+(2b)^2][(3a)^2(2b)^2]=[(3a)^2+(2b)^2][(3a-2b)(3a+2b)]8.=(x+y+z)(x+y-z)9.-0....
绛旓細(2) x^5+x+1 =x^5-x²+x²+x+1 =x²(x³-1)+(x²+x+1)=x²(x-1)(x²+x+1)+(x²+x+1)=(x³-x)(x²+x+1)+(x²+x+1)=(x³-x+1)(x²+x+1)(2) a^3+2a^2-12a+15 =a³+...
绛旓細绗竴涓細鎻愬叕鍥犲紡寰楋細锛17.2+2.8+1.7+2.3)X 1/4=24X 1/4=6 鍙互琚6鏁撮櫎锛屼笉鍙互琚8鏁撮櫎銆傜浜屼釜锛氭彁鍏洜寮忓緱锛氾紙9999+1)X9999=10000X9999=99990000 鍙互琚100锛1000鏁撮櫎锛屼笉鍙互琚19999鏁撮櫎銆傚笇鏈涘彲浠ュ府鍒颁綘锛屾湜閲囩撼~
绛旓細绗竴棰橈紙1锛夛紙a+b+c)(x-y)(2)(2a+b)^2 (3)=-2x(x+6y^2-4y^3)(4)x^(2n+1)(1+x^4)绗簩棰(1)(n+m)(n-m)(2)(y+2x)(y-2x)(3)(xy+1)(xy-1)(4)=8x^2-16y^2-7x^2-xy+xy =x^2-16y^2 =(x+4y)(x-4y)(5)=m^2-4 =(m+2)(m-2)(6)a^2(a+...
