1).(y-x)²+2x-2y=(x-y)²+2(x-y)=(X-y)(x-y+2)
2).a²-16(a-b)²=[a+4(a-b)][a-4(a-b)]=(5a-4b)(-3a+4b)
3)x²-2xy+y²+2x-2y-3
=(x²-2xy+y²)+(2x-2y)-3
=(x-y)²+2(x-y)-3
=(x-y+3)(x-y-1) (æåè¿ä¸æ¥ç¨çæ¯ååç¸ä¹æ³å解ï¼
4ï¼x²-3xy-10ya^3-2a^2b-a+2b
²=ï¼x-5y)(x+2y) (ç¨çæ¯ååç¸ä¹æ³å解ï¼
5)(x²+4)²-16x²
=(x²+4+4x)(x²+4-4x)(å¹³æ¹å·®å
¬å¼ï¼
=ï¼x+2)²(x-2)²(å®å
¨å¹³æ¹å
¬å¼ï¼
6ï¼a^3-a+2b-2a^2b
=a^3-2a²b-a+2b
=(a^3-2a²b)-(a-2b)(åç»ï¼
=a²(a-2b)-(a-2b)ï¼æåå
¬å å¼ï¼
=(a²-1)(a-2b)ï¼æåå
¬å å¼ï¼
=(a+1)(a-b)(a-2b)ï¼å¹³æ¹å·®å
¬å¼ï¼
7ï¼144x^2-(-y)^2
=144x^2-y^2=ï¼12x+y)(12x-y)
8ï¼(x+m)^2-(y+m)^2
=ã(x+m)+(Y+m)ããï¼x+m)-(y+m)ã
=ãx+m+Y+mããx+m-y-mã
=(x+y+2m)(x+y)
9)4(a+b)^2-9(a-b)^2
=ã2(a+b)+3(a-b)ãã2(a+b)-3(a-b)ã
=ã2a+2b+3a-3bãã2a+2b-3a+3bã
=ï¼5a-b)(-a+5b)
10)a^4-81b^4
=ï¼a^2+9b^2ï¼ï¼a^2-9b^2ï¼
=ï¼a^2+9b^2ï¼ï¼a+3b)(a-3b)
11ï¼4x^3y-9xy^3=xy(4x^2-9y^2)=xyï¼2x+3y)(2x-3y)
12)x(x-1)(x-2)-6=x^3-3x^2+2x-6=x^2(x-3)+2(x-3)=(x^2-2)(x-3)
13)ab(x^2+1)+x(a^2+b^2)
=abx^2+ab+xa^2+xb^2
=abx^2+xa^2+xb^2+ab
=ax(bx+a)+b(a+bx)
=(ax+b)(bx+a)
éæ©ï¼1ãä¸ååå¼ä¸ä»å·¦å°å³çåå½¢å±äºå解å å¼çæ¯ï¼ C ï¼
A ï¼a(aï¼bï¼1)=a^2ï¼abï¼a Bï¼ a^2 âaï¼2=a(aï¼1)ï¼2
C ï¼ï¼4 a^2ï¼9b^2=(ï¼2aï¼3b)(2aï¼3b) Dï¼ 2xï¼1=x(2ï¼1/x)
2ãä¸åå¤é¡¹å¼ä¸ï¼è½ç¨æå
¬å å¼æ³å解å å¼çæ¯ï¼ B ï¼
Aï¼ x^2ï¼y Bï¼ x^2ï¼2x Cï¼ x^2ï¼y^2 Dï¼x^2ï¼xyï¼y^2
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