ä¸.计ç®
(x-3)(x-7)+4
2
123 -124*122
(2a+b+3)(2a+b-3)
ï¼x+2y-1ï¼ï¼x-2y+1ï¼-ï¼x-2y-1).(a^2+3)(a-2)-a(a^2-2a-2)
(2).(3/4a^6x^2+6/5a^3x^4-0.9ax^3)÷3/5ax^2
1ï¼^2
5a^2b-[3ab^2-(4ab^2-2a^2b)]
(-3a-2)(3a-2)
(3+2a)(-3+2a)
ï¼2x+3)(3x-2)
6p(p+9)-4q(p+q)
m(a-3)+2(3-a)
15a^3 +10a^2
12abc-3bc^2
äº.åç®æ±å¼:
(1).1/2x+(-3/2x+1/3y^2)-(2x-2/3y^2),å
¶ä¸x=-1/3,y=2/3
(2).[(xy+2)(xy-2)-2x^2y^2+4]÷(xy),å
¶ä¸x=10,y=-1/25
(3).x(x+2y)-(x+1)^2+2x,å
¶ä¸x=1/25,y=-25
ï¼4ï¼[(5a+2b)(3a+2b)+(a-2b)(a+2b)]÷4a,å
¶ä¸a=2,b=-3
ï¼5ï¼å·²ç¥x^2-x-1=0,æ±ä»£æ°å¼-x^3+2x^2+2002çå¼
ï¼6ï¼å·²ç¥x^2-x-1=0,æ±ä»£æ°å¼-x^3+2x^2+2002çå¼
ä¸.å©ç¨ä¹æ³å
¬å¼è®¡ç®
(3+1ï¼ï¼3ï¼¾2ï¼1ï¼ï¼3ï¼¾4ï¼1ï¼ï¼ï¼ï¼ï¼ï¼ï¼3ï¼¾2n+1)=
1.å·²ç¥æ¹ç¨x^2 -y^2=2003,é£ä¹æ¹ç¨çæ£æ´æ°è§£ä¸å
±æå 个?
2.å·²ç¥(x+my)(x+ny)=x^2+2xy-6Y^2,æ±-(m+n)mnå¼ (ååºéä½æ¥éª¤)
å.解ç
1.设4x^2+mx+121æ¯ä¸ä¸ªå®å
¨å¹³æ¹å¼,åmçå¼
2.å·²ç¥ax+by=3,ay-bx=5,ze (a^2+b^2)(x^2+y^2)çå¼
3.è¥(x^2+x+1)^2=a12x^12+a11x^11+a10x^10+....+a2x^2+a1x+a0,ze a11+a9+a7+a5+a3+a1çå¼
4.计ç®:(x+y-z)^2
5.(x+y+2)(x+y-2)
å»ºè®®ä½ ä¹°å æ¬ä¹¦ï¼ä¾å¦å
¸ä¸ç¹ï¼ä¸åä¸é¢ï¼å°åçä¹ç±»çã
åèèµæï¼äºæ¹åæµ·
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