1.å·²ç¥x+y=5,2x-y=1ï¼åç®xy(x+yçå¹³æ¹ï¼-yçå¹³æ¹(xy-x)+2x(x-yçå¹³æ¹),并æ±å®ä»¬çå¼ã
3.3ab-4ab+8ab-7ab+ab=______ï¼
4ï¼7x-(5x-5y)-y=______ï¼
5ï¼23a3bc2-15ab2c+8abc-24a3bc2-8abc=______ï¼
6ï¼-7x2+6x+13x2-4x-5x2=______ï¼
7ï¼2y+(-2y+5)-(3y+2)ï¼______ï¼
11ï¼(2x2-3xy+4y2)+(x2+2xy-3y2)=______ï¼
12ï¼2a-(3a-2b+2)+(3a-4b-1)=______ï¼
13ï¼-6x2-7x2+15x2-2x2ï¼______ï¼
14ï¼2x-(x+3y)-(-x-y)-(x-y)ï¼______ï¼
16ï¼2x+2y-[3x-2(x-y)]=______ï¼
17ï¼5-(1-x)-1-(x-1)=______ï¼
18ï¼( )+(4xy+7x2-y2)=10x2-xyï¼
19ï¼(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3ï¼
21ï¼å·²ç¥A=x3-2x2+x-4ï¼B=2x3-5x+3ï¼è®¡ç®A+B=______ï¼
22ï¼å·²ç¥A=x3-2x2+x-4ï¼B=2x3-5x+3ï¼è®¡ç®A-B=______ï¼
23ï¼è¥a=-0.2ï¼b=0.5ï¼ä»£æ°å¼-(|a2b|-|ab2|)çå¼ä¸º______ï¼
25ï¼ä¸ä¸ªå¤é¡¹å¼åå»3m4-m3-2m+5å¾-2m4-3m3-2m2-1ï¼é£ä¹è¿ä¸ªå¤é¡¹å¼çäº______ï¼
26ï¼-(2x2-y2)-[2y2-(x2+2xy)]=______ï¼
27ï¼è¥-3a3b2ä¸5ax-1by+2æ¯å类项ï¼åx=______ï¼y=______ï¼
28ï¼(-y+6+3y4-y3)-(2y2-3y3+y4-7)ï¼______ï¼
29ï¼åç®ä»£æ°å¼4x2-[7x2-5x-3(1-2x+x2)]çç»ææ¯______ï¼
30ï¼2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )ï¼
31ï¼3a-(2a-3b)+3(a-2b)-b=______ï¼
32ï¼åç®ä»£æ°å¼x-[y-2x-(x+y)]çäº______ï¼
33ï¼[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1ï¼
34ï¼3x-[y-(2x+y)]=______ï¼
35ï¼åç®|1-x+y|-|x-y|(å
¶ä¸xï¼0ï¼yï¼0)çäº______ï¼
36ï¼å·²ç¥xâ¤yï¼x+y-|x-y|=______ï¼
37ï¼å·²ç¥xï¼0ï¼yï¼0ï¼åç®|x+y|-|5-x-y|=______ï¼
38ï¼4a2n-an-(3an-2a2n)ï¼______ï¼
39ï¼è¥ä¸ä¸ªå¤é¡¹å¼å ä¸-3x2y+2x2-3xy-4å¾
2x2y+3xy2-x2+2xyï¼
åè¿ä¸ªå¤é¡¹å¼ä¸º______ï¼
40ï¼-5xm-xm-(-7xm)+(-3xm)=______ï¼
41ï¼å½a=-1ï¼b=-2æ¶ï¼
[a-(b-c)]-[-b-(-c-a)]ï¼______ï¼
43ï¼å½a=-1ï¼b=1ï¼c=-1æ¶ï¼
-[b-2(-5a)]-(-3b+5c)ï¼______ï¼
44ï¼-2(3x+z)-(-6x)+(-5y+3z)=______ï¼
45ï¼-5an-an+1-(-7an+1)+(-3an)ï¼______ï¼
46ï¼3a-(2a-4b-6c)+3(-2c+2b)=______ï¼
48ï¼9a2+[7a2-2a-(-a2+3a)]=______ï¼
50ï¼å½2y-x=5æ¶ï¼5(x-2y)2-3(-x+2y)-100=______ï¼
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52ï¼ä¸ååå¼ä¸è®¡ç®ç»æ为-7x-5x2+6x3çæ¯ [ ]
Aï¼3x-(5x2+6x3-10x)ï¼
Bï¼3x-(5x2+6x3+10x)ï¼
Cï¼3x-(5x2-6x3+10x)ï¼
Dï¼3x-(5x2-6x3-10x)ï¼
53ï¼æ(-x-y)+3(x+y)-5(x+y)å并åç±»é¡¹å¾ [ ]
Aï¼(x-y)-2(x+y)ï¼
Bï¼-3(x+y)ï¼
Cï¼(-x-y)-2(x+y)ï¼
Dï¼3(x+y)ï¼
54ï¼2a-[3b-5a-(2a-7b)]çäº [ ]
Aï¼-7a+10bï¼
Bï¼5a+4bï¼
Cï¼-a-4bï¼
Dï¼9a-10bï¼
55ï¼åå»-3mçäº5m2-3m-5ç代æ°å¼æ¯ [ ]
Aï¼5(m2-1)ï¼
Bï¼5m2-6m-5ï¼
Cï¼5(m2+1)ï¼
Dï¼-(5m2+6m-5)ï¼
56ï¼å°å¤é¡¹å¼2ab-9a2-5ab-4a2ä¸çå类项åå«ç»åå¨ä¸èµ·ï¼åºä¸º [ ]
Aï¼(9a2-4a2)+(-2ab-5ab)ï¼
Bï¼(9a2+4a2)-(2ab-5ab)ï¼
Cï¼(9a2-4a2)-(2ab+5ab)ï¼
Dï¼(9a2-4a2)+(2ab-5ab)ï¼
57ï¼å½a=2ï¼b=1æ¶ï¼-a2b+3ba2-(-2a2b)çäº [ ]
Aï¼20ï¼
Bï¼24ï¼
Cï¼0ï¼
Dï¼16ï¼
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Aï¼æ²¡æå类项ï¼
Bï¼(2)ä¸(4)æ¯å类项ï¼
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59ï¼è¥AåBå为äºæ¬¡å¤é¡¹å¼ï¼åA-Bä¸å®æ¯ [ ]
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Dï¼æ¬¡æ°ä½äºäºæ¬¡çå¤é¡¹å¼ï¼
60ï¼-ï½[-(x+y)]ï½+ï½-[(x+y)]ï½çäº [ ]
Aï¼0ï¼
Bï¼-2yï¼
Cï¼x+yï¼
Dï¼-2x-2yï¼
61ï¼è¥A=3x2-5x+2ï¼B=3x2-5x+6ï¼åAä¸Bç大å°æ¯
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Aï¼Aï¼Bï¼
Bï¼A=Bï¼
Cï¼Aï¼Bï¼
Dï¼æ æ³ç¡®å®ï¼
62ï¼å½m=-1æ¶ï¼-2m2-[-4m2+(-m2)]çäº [ ]
Aï¼-7ï¼
Bï¼3ï¼
Cï¼1ï¼
Dï¼2ï¼
63ï¼å½m=2ï¼n=1æ¶ï¼å¤é¡¹å¼-m-[-(2m-3n)]+[-(-3m)-4n]çäº [ ]
Aï¼1ï¼
Bï¼9ï¼
Cï¼3ï¼
Dï¼5ï¼
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65ï¼-5an-an-(-7an)+(-3an)çäº [ ]
Aï¼-16anï¼
Bï¼-16ï¼
Cï¼-2anï¼
Dï¼-2ï¼
66ï¼(5a-3b)-3(a2-2b)çäº [ ]
Aï¼3a2+5a+3bï¼
Bï¼2a2+3bï¼
Cï¼2a3-b2ï¼
Dï¼-3a2+5a-5bï¼
67ï¼x3-5x2-4x+9çäº [ ]
Aï¼(x3-5x2)-(-4x+9)ï¼
Bï¼x3-5x2-(4x+9)ï¼
Cï¼-(-x3+5x2)-(4x-9)ï¼
Dï¼x3+9-(5x2-4x)ï¼
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69ï¼4x2y-5xy2çç»æåºä¸º [ ]
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Dï¼ä»¥ä¸çæ¡é½ä¸å¯¹ï¼
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70ï¼(4x2-8x+5)-(x3+3x2-6x+2)ï¼
72ï¼(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2)ï¼
73ï¼-{2a2b-[3abc-(4ab2-a2b)]ï½ï¼
74ï¼(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b)ï¼
75ï¼(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2)ï¼
76ï¼(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4)ï¼
77ï¼(4a-2b-c)-5a-[8b-2c-(a+b)]ï¼
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