4个回答
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(1)2x2-5x-12; (2)3x2-5x-2;
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2.
(1)4n2+4n-15; (2)6a2+a-35;
(3)5x2-8x-13; (4)4x2+15x+9
(5)15x2+x-2; (6)6y2+19y+10;
(7)20-9y-20y2; (8)7(x-1) 2+4(x-1)(y+2)-20(y+2)
(1) 12x^2+10xy-12x+5y-9
(2) 2y^2-ay-3by-a^2+b^2
(3) x^3+(2a+1)^2+(a^2+2a-1)
(4)a^2+b^2-2ab-2a+2b-8
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2.
(1)4n2+4n-15; (2)6a2+a-35;
(3)5x2-8x-13; (4)4x2+15x+9
(5)15x2+x-2; (6)6y2+19y+10;
(7)20-9y-20y2; (8)7(x-1) 2+4(x-1)(y+2)-20(y+2)
(1) 12x^2+10xy-12x+5y-9
(2) 2y^2-ay-3by-a^2+b^2
(3) x^3+(2a+1)^2+(a^2+2a-1)
(4)a^2+b^2-2ab-2a+2b-8
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(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2
(9)6x2-13xy+6y2; (10)8x2y2+6xy-35;
(11)18x2-21xy+5y2; (12)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(13)2x2-5x-12; (14)3x2-5x-2;
(15)6x2-13x+5; (16)7x2-19x-6;
(17)12x2-13x+3; (18)4x2+24x+27.
(19)4n2+4n-15; (20)6a2+a-35;
(21)5x2-8x-13; (22)4x2+15x+9
(23)15x2+x-2; (24)6y2+19y+10;
(25)20-9y-20y2; (26)7(x-1) 2+4(x-1)(y+2)-20(y+2)
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2
(9)6x2-13xy+6y2; (10)8x2y2+6xy-35;
(11)18x2-21xy+5y2; (12)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(13)2x2-5x-12; (14)3x2-5x-2;
(15)6x2-13x+5; (16)7x2-19x-6;
(17)12x2-13x+3; (18)4x2+24x+27.
(19)4n2+4n-15; (20)6a2+a-35;
(21)5x2-8x-13; (22)4x2+15x+9
(23)15x2+x-2; (24)6y2+19y+10;
(25)20-9y-20y2; (26)7(x-1) 2+4(x-1)(y+2)-20(y+2)
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展开全部
2x2-5x-12
凉山~这些X
后面
的2都是
平方
的意思么?
十字相乘我倒是会,不过你的意思和格式确实没怎么明白,(比如不要这些题是什么意思……)先做前六个给你吧~
看到的话问题补充,然后我会把后面的都一一补全
另外……你们老师没有讲
原理
么……
(1)2x2-5x-12
=(2x+3)(x-4)
(2)3x2-5x-2
=(3x+1)(x-2)
(3)6x2-13x+5
=(2x-5)(3x+1)
(4)7x2-19x-6
=(7x+2)(x-3)
(5)12x2-13x+3
=(3x-1)(4x-3)
(6)4x2+24x+27
=(2x+3)(2x+9)
凉山~这些X
后面
的2都是
平方
的意思么?
十字相乘我倒是会,不过你的意思和格式确实没怎么明白,(比如不要这些题是什么意思……)先做前六个给你吧~
看到的话问题补充,然后我会把后面的都一一补全
另外……你们老师没有讲
原理
么……
(1)2x2-5x-12
=(2x+3)(x-4)
(2)3x2-5x-2
=(3x+1)(x-2)
(3)6x2-13x+5
=(2x-5)(3x+1)
(4)7x2-19x-6
=(7x+2)(x-3)
(5)12x2-13x+3
=(3x-1)(4x-3)
(6)4x2+24x+27
=(2x+3)(2x+9)
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1 x2+x-6=0 2 2x2-4x-6=0 3 20x2+9x+1=0 4 x2+x-2
5 x2+3x-4 6 5x2-8x-13
(1)4n2+4n-15; (2)6a2+a-35;
(3)5x2-8x-13; (4)4x2+15x+9
(5)15x2+x-2; (6)6y2+19y+10;
(7)20-9y-20y2
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2
(9)6x2-13xy+6y2; (10)8x2y2+6xy-35;
(11)18x2-21xy+5y2; (12)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(13)2x2-5x-12; (14)3x2-5x-2;
(15)6x2-13x+5; (16)7x2-19x-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2
5 x2+3x-4 6 5x2-8x-13
(1)4n2+4n-15; (2)6a2+a-35;
(3)5x2-8x-13; (4)4x2+15x+9
(5)15x2+x-2; (6)6y2+19y+10;
(7)20-9y-20y2
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2
(9)6x2-13xy+6y2; (10)8x2y2+6xy-35;
(11)18x2-21xy+5y2; (12)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(13)2x2-5x-12; (14)3x2-5x-2;
(15)6x2-13x+5; (16)7x2-19x-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2
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