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81ï¼(-3x3+2x2-5x+1)-(5-6x-x2+x3)ï¼
83ï¼3x-(2x-4y-6x)+3(-2z+2y)ï¼
84ï¼(-x2+4+3x4-x3)-(x2+2x-x4-5)ï¼
85ï¼è¥A=5a2-2ab+3b2ï¼B=-2b2+3ab-a2ï¼è®¡ç®A+Bï¼
86ï¼å·²ç¥A=3a2-5a-12ï¼B=2a2+3a-4ï¼æ±2(A-B)ï¼
87ï¼2m-{-3n+[-4m-(3m-n)]ï½ï¼
88ï¼5m2n+(-2m2n)+2mn2-(+m2n)ï¼
89ï¼4(x-y+z)-2(x+y-z)-3(-x-y-z)ï¼
90ï¼2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2)ï¼
92ï¼2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2)ï¼
94ï¼4x-2(x-3)-3[x-3(4-2x)+8]ï¼
(å)å°ä¸ååå¼å
åç®ï¼åæ±å¼
97ï¼å·²ç¥a+b=2ï¼a-b=-1ï¼æ±3(a+b)2(a-b)2-5(a+b)2Ã(a-b)2çå¼ï¼
98ï¼å·²ç¥A=a2+2b2-3c2ï¼B=-b2-2c2+3a2ï¼C=c2+2a2-3b2ï¼æ±(A-B)+Cï¼
99ï¼æ±(3x2y-2xy2)-(xy2-2x2y)ï¼å
¶ä¸x=-1ï¼y=2ï¼
101ï¼å·²ç¥|x+1|+(y-2)2=0ï¼æ±ä»£æ°å¼5(2x-y)-3(x-4y)çå¼ï¼
106ï¼å½P=a2+2ab+b2ï¼Q=a2-2ab-b2æ¶ï¼æ±P-[Q-2P-(P-Q)]ï¼
107ï¼æ±2x2-ï½-3x+5+[4x2-(3x2-x-1)]ï½çå¼ï¼å
¶ä¸x=-3ï¼
110ï¼å½x=-2ï¼y=-1ï¼z=3æ¶ï¼æ±5xyz-ï½2x2y-[3xyz-(4xy2-x2y)]ï½çå¼ï¼
113ï¼å·²ç¥A=x3-5x2ï¼B=x2-6x+3ï¼æ±A-3(-2B)ï¼
(äº)综åç»ä¹
115ï¼å»æ¬å·ï¼ï½-[-(a+b)]ï½-ï½-[-(a-b)]ï½ï¼
116ï¼å»æ¬å·ï¼-[-(-x)-y]-[+(-y)-(+x)]ï¼
117ï¼å·²ç¥A=x3+6x-9ï¼B=-x3-2x2+4x-6ï¼è®¡ç®2A-3Bï¼å¹¶æç»ææ¾å¨åé¢å¸¦â-âå·çæ¬å·å
ï¼
118ï¼è®¡ç®ä¸å¼ï¼å¹¶æç»ææ¾å¨åé¢å¸¦â-âå·çæ¬å·å
ï¼
(-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y)ï¼
119ï¼å»æ¬å·ãå并å类项ï¼å°ç»ææxçåå¹æåï¼å¹¶æåä¸é¡¹æ¾å¨å¸¦æâ-âå·çæ¬å·å
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120ï¼ä¸æ¹åä¸å¼çå¼ï¼å°å
¶ä¸åæ¬å·åç符å·é½åæç¸åç符å·ï¼(x3+3x2)-(3x2y-7xy)+(2y3-3y2)ï¼
121ï¼æå¤é¡¹å¼4x2y-2xy2+4xy+6-x2y2+x3-y2çä¸æ¬¡é¡¹æ¾å¨åé¢å¸¦æâ-âå·çæ¬å·å
ï¼äºæ¬¡é¡¹æ¾å¨åé¢å¸¦æâ+âå·çæ¬å·å
ï¼å次项å常æ°é¡¹æ¾å¨åé¢å¸¦æâ-âå·çæ¬å·å
ï¼
122ï¼æä¸åå¤é¡¹å¼çæ¬å·å»æï¼å并å类项ï¼å¹¶å°å
¶å项æ¾å¨åé¢å¸¦æâ-âå·çæ¬å·å
ï¼åæ±2x-2[3x-(5x2-2x+1)]-4x2çå¼ï¼å
¶ä¸x=-1ï¼
123ï¼å并å类项ï¼
7x-1.3z-4.7-3.2x-y+2.1z+5-0.1yï¼
124ï¼å并å类项ï¼5m2n+5mn2-mn+3m2n-6mn2-8mnï¼
126ï¼å»æ¬å·ï¼å并å类项ï¼
(1)(m+1)-(-n+m)ï¼
(2)4m-[5m-(2m-1)]ï¼
127ï¼åç®ï¼2x2-ï½-3x-[4x2-(3x2-x)+(x-x2)]ï½ï¼
128ï¼åç®ï¼-(7x-y-2z)-ï½[4x-(x-y-z)-3x+z]-xï½ï¼
129ï¼è®¡ç®ï¼(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a)ï¼
130ï¼åç®ï¼a3-(a2-a)+(a2-a+1)-(1-a4+a3)ï¼
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