因式分解
6x^2-7x-5,12a^2+14a-10,6(x-y)^2+5(y-x)+1,3a^2×b^2-17abxy+10x^2×y^2,10(x+2)^2-29(x+2)+...
6x^2-7x-5,12a^2+14a-10,6(x-y)^2+5(y-x)+1,3a^2×b^2-17abxy+10x^2×y^2,10(x+2)^2-29(x+2)+10,2a^4-3a^2-14,(m^2-n^2)x^2+m^2×x+n^2×x+mn,2(6x^2+x)^2-9(6x^2+x)+5,x^2-3xy+2y^2+x-2 (有些地方乘号省略了,乘号比X要小一点,不要搞错)
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6x²-7x-5
=(2x+1)(3x-5)
12a²+14a-10
=2(6a²+7a-5)
=2(2a-1)(3a+5)
6(x-y)²+5(y-x)+1
=6(x-y)²-5(x-y)+1
=[2(x-y)+1][3(x-y)-5]
=(2x-2y+1)(3x-3y-5)
3a²×b²-17ab
=3(ab)²-17ab
=ab(3ab-17)
xy+10x²×y²
=xy+10(xy)²
=xy(1+10xy)
10(x+2)²-29(x+2)+10
=[5(x+2)-2][2(x+2)-5]
=(5x-8)(2x-1)
2a^4-3a²-14
=2(a²)²-3a²-14
=(2a²-7)(a²+2)
(m²-n²)x²+m²×x+n²×x+mn
=(m+n)(m-n)x²+(m²+n²)x+mn
=[(m+n)x+m][(m-n)x+n]
2(6x²+x)²-9(6x²+x)+5?应该是2(6x²+x)²-9(6x²+x)-5吧?
2(6x²+x)²-9(6x²+x)-5
=[2(6x²+x)+1][(6x²+x)-5]
=(12x²+6x+1)(6x²+x-5)
=(12x²+6x+1)(6x-5)(x+1)
x²-3xy+2y²+x-2?应该是x²-3xy+2y²+x-2y吧?
x²-3xy+2y²+x-2y
=(x-2y)(x-y)+x-2y
=(x-2y)(x-y+1)
给楼主一个建议:
在一个问题中,不要一次性出这么多题。
不少知友,一看一个问题题目太多,就“闪”了。
=(2x+1)(3x-5)
12a²+14a-10
=2(6a²+7a-5)
=2(2a-1)(3a+5)
6(x-y)²+5(y-x)+1
=6(x-y)²-5(x-y)+1
=[2(x-y)+1][3(x-y)-5]
=(2x-2y+1)(3x-3y-5)
3a²×b²-17ab
=3(ab)²-17ab
=ab(3ab-17)
xy+10x²×y²
=xy+10(xy)²
=xy(1+10xy)
10(x+2)²-29(x+2)+10
=[5(x+2)-2][2(x+2)-5]
=(5x-8)(2x-1)
2a^4-3a²-14
=2(a²)²-3a²-14
=(2a²-7)(a²+2)
(m²-n²)x²+m²×x+n²×x+mn
=(m+n)(m-n)x²+(m²+n²)x+mn
=[(m+n)x+m][(m-n)x+n]
2(6x²+x)²-9(6x²+x)+5?应该是2(6x²+x)²-9(6x²+x)-5吧?
2(6x²+x)²-9(6x²+x)-5
=[2(6x²+x)+1][(6x²+x)-5]
=(12x²+6x+1)(6x²+x-5)
=(12x²+6x+1)(6x-5)(x+1)
x²-3xy+2y²+x-2?应该是x²-3xy+2y²+x-2y吧?
x²-3xy+2y²+x-2y
=(x-2y)(x-y)+x-2y
=(x-2y)(x-y+1)
给楼主一个建议:
在一个问题中,不要一次性出这么多题。
不少知友,一看一个问题题目太多,就“闪”了。
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1. 6x^2-7x-5
=(2x+1)(3x-5)
2. 12a^2+14a-10
=(3x-5)(4x+2)
3. 6(x-y)^2+5(y-x)+1
=6(x-y)^2-5(x-y)+1
=(2x-y-1)(3x-y-1)
4. 3a^2b^2-17abxy+10x^2y^2
=(3ab-2xy)(ab-5xy)
5. 10(x+2)^2-29(x+2)+10
=[2(x+2)-5][5(x+2)-2]
=[2x-1][5x+8]
6. 2a^4-3a^2-14
=(a^2-2)(2a^2-7)
7. (m^2-n^2)x^2+m^2x+n^2x+mn
=(m^2-n^2)x^2+(m^2+n^2)x+mn
=[(m+n)x+m][(m-n)x+n]
8. 2(6x^2+x)^2-9(6x^2+x)-5
=[6x^2+x-5][2(6x^2+x)+1]
=(x+1)(6x-5)(12x^2+2x+1)
=(2x+1)(3x-5)
2. 12a^2+14a-10
=(3x-5)(4x+2)
3. 6(x-y)^2+5(y-x)+1
=6(x-y)^2-5(x-y)+1
=(2x-y-1)(3x-y-1)
4. 3a^2b^2-17abxy+10x^2y^2
=(3ab-2xy)(ab-5xy)
5. 10(x+2)^2-29(x+2)+10
=[2(x+2)-5][5(x+2)-2]
=[2x-1][5x+8]
6. 2a^4-3a^2-14
=(a^2-2)(2a^2-7)
7. (m^2-n^2)x^2+m^2x+n^2x+mn
=(m^2-n^2)x^2+(m^2+n^2)x+mn
=[(m+n)x+m][(m-n)x+n]
8. 2(6x^2+x)^2-9(6x^2+x)-5
=[6x^2+x-5][2(6x^2+x)+1]
=(x+1)(6x-5)(12x^2+2x+1)
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(2x+1)(3x-5) (3a+5)(4a-2) (2(y-x)+1)(3(y-x)+1) (3ab-2xy)(ab-5xy) (5(x+2)+2)(2(x+2)-5) (a²+2)(2a²-7) ((m+n)x+m)((m-n)x+n) ( 2(6x^2+x)+1)((6x^2+x)-5)这个题目是-5吧 最后一题最后是x-y吧 ( x-2y+1)(x-y)
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你可以拍张图上来,这样容易错。
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