1.å·²ç¥|a+3|+(b-1)^=0,æ±3a^-2ab+b^çå¼.
2.å·²ç¥ï¼a-1)^+4(b+2)+|c+1|=0,æ±(a^-ac+c^)-2(a^+bc-2c^)çå¼.
3.ï¼3x^-2y^-3xy)-(2x^-3y^+xy),å
¶ä¸x^+y^=2,xy=-1.
4.(-a^-ab+b^)-(-a^+2ab+b^),å
¶ä¸a=-1/15,b=10.
5.å·²ç¥ï¼|a+1/2|+(b-3)^=0,æ±ä»£æ°å¼[(2a+b)^+(2a+b)(b-2a)-6b]\(2b)çå¼.6.10a(5ä¹ä»¥açå¹³æ¹-b)-2a(5b+25ä¹ä»¥açå¹³æ¹ï¼ï¼3ab,å
¶ä¸a=1,b=1/23.7.1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7,(x=2) å
åç®,åæ±å¼.
8.5abc-{2a²b[3abc-(4ab²-a²b)]-2ab²}å
¶ä¸a=-2,b=3,c=-1/4.
9.å·²ç¥a²+a-1=0,æ±ä»£æ°å¼a³+2a²+5çå¼.
10.(a+2)çäºæ¬¡æ¹-(a-1)(a+1),å
¶ä¸aï¼3ï¼25 å
åç®åæ±å¼
11.ï¼X-1)çäºæ¬¡æ¹+(x+3)(x-3)+(x-3)(x-1),å
¶ä¸Xçäºæ¬¡æ¹-2x=2
12.å·²ç¥:a+b=12,açå¹³æ¹+bçå¹³æ¹=74 æ±abçå¼
13.å
åç®,åæ±å¼ (4x-3y)çå¹³æ¹-(3x-2y)(3x+2y),å
¶ä¸x=2,y=1
14.åç®æ±å¼ï¼ï¼1 + a - 5aï¼-ï¼- a +2a ï¼,å
¶ä¸a= - 3
15.å·²ç¥3åä¹a=4åä¹b=5åä¹c,æ±ä»£æ°å¼2b-aåä¹2a+b+cçå¼
16.ï¼xï¼3ï¼2ï¼|yï¼2|=0åyxçå¼ä¸ºï¼ ï¼
17.设a,b,c为æçæ°,ä¸|a|+a=0,|ab|=ab,|c|-c=0 æ±å¼å|b|-|a+b|-|c-b|+|a-c|çå¼
18.9x+6x^2-3(x-2/3x^2),å
¶ä¸x=-2 9x+6x^2-3x+11/3x^2=6x+29/3x^2=6*(-2)+29/3*(-2)=-12-58/3=-94/3
19.1/4(-4x^2+2x-8)-(1/2x-1),å
¶ä¸x=1/2 -x^2+1/2x-2-1/2x+1=-1/2^2+1/4-2-1/4+1=1/4-1=-3/4
20.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),å
¶ä¸a=-1,b=1 5a^2-3b^2+a^2+b^2-5a^2-3b^2=5-3+1+1-5-3=-6+2=-4
21.2(a^2b+ab^2)-2(a^2b-1)-2ab^2-2,å
¶ä¸a=-2,b=2 2a^2*2b+2ab^2-2a^2*2b*2-2ab^2-2=8*4-4*4-2=-18
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