1.4a^2-b^2+6a-3b
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1.4a^2-b^2+6a-3b
2.a^2(b^2-c^2)-c^2(b-c)(a+b)
3.20x^2-43xy+14y^2
4.5x^2+4xy-28y^2
5.20x^2-43xy+14y^2
6.3x^2+12x-5
7.x^2+4x-4
8.x^2-2xy-35y^2
9.2x^2-7x-15
10.x^4+2x^2-3
11.(x+y)^2-3(x+y)+2
12.4x^2-12x+5
13.x^2+2-3x
2.a^2(b^2-c^2)-c^2(b-c)(a+b)
3.20x^2-43xy+14y^2
4.5x^2+4xy-28y^2
5.20x^2-43xy+14y^2
6.3x^2+12x-5
7.x^2+4x-4
8.x^2-2xy-35y^2
9.2x^2-7x-15
10.x^4+2x^2-3
11.(x+y)^2-3(x+y)+2
12.4x^2-12x+5
13.x^2+2-3x
1.4a^2-b^2+6a-3b
=(2a+b)(2a-b)+3(2a-b)
=(2a-b)(2a+b+1)
2.a^2(b^2-c^2)-c^2(b-c)(a+b)
=a^2(b+c)(b-c)-c^2(b-c)(a+b)
=(b-c)[a^2(b+c)-c^2(a+b)]
3.20x^2-43xy+14y^2
=(8x-7y)(5x-2y))
4.5x^2+4xy-28y^2
=(5x+14y)(x-2y)
5.20x^2-43xy+14y^2
=(8x-7y)(5x-2y))
6.3x^2+12x-5
=3(x+2)^2-17
=3(x+2+√51/3)(x+2-√51/3)
7.x^2+4x-4
=(x+2)^2-8
=(x+2+2√2)(x+2-2√2)
8.x^2-2xy-35y^2
=(x-y)^2-(6y)^2
=(x+5y)(x-7y)
9.2x^2-7x-15
=(x-5y)(2x+3y)
10.x^4+2x^2-3
=(x^2+3)(x^2-1)
=(x^2+3)(x-1)(x+1)
11.(x+y)^2-3(x+y)+2
=(x+y-1)(x+y-2)
12.4x^2-12x+5
=(2x-5)(2x-1)
13.x^2+2-3x
=(x-1)(x-2)
=(2a+b)(2a-b)+3(2a-b)
=(2a-b)(2a+b+1)
2.a^2(b^2-c^2)-c^2(b-c)(a+b)
=a^2(b+c)(b-c)-c^2(b-c)(a+b)
=(b-c)[a^2(b+c)-c^2(a+b)]
3.20x^2-43xy+14y^2
=(8x-7y)(5x-2y))
4.5x^2+4xy-28y^2
=(5x+14y)(x-2y)
5.20x^2-43xy+14y^2
=(8x-7y)(5x-2y))
6.3x^2+12x-5
=3(x+2)^2-17
=3(x+2+√51/3)(x+2-√51/3)
7.x^2+4x-4
=(x+2)^2-8
=(x+2+2√2)(x+2-2√2)
8.x^2-2xy-35y^2
=(x-y)^2-(6y)^2
=(x+5y)(x-7y)
9.2x^2-7x-15
=(x-5y)(2x+3y)
10.x^4+2x^2-3
=(x^2+3)(x^2-1)
=(x^2+3)(x-1)(x+1)
11.(x+y)^2-3(x+y)+2
=(x+y-1)(x+y-2)
12.4x^2-12x+5
=(2x-5)(2x-1)
13.x^2+2-3x
=(x-1)(x-2)
(3a+2b)(6a-5b)(2b-3a)(5a+6b)
(a+2b)(2a+4b)(3a+6b)(4a+8b)
若a,b满足|a+5b-2|+(a+b-6)²=0,求代数式(a-3b)(a+2b)-(a+5b)(a+3b)
先化简,再求值:(2a-b)^2-(2a+b)(a-b)-3(a-3b)(a+3b),其中|a-1|+b^2=6b-9
A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1
1.(a-b)^2(b-a)^3(a-b)^-4
3a+2b用a+b,a-b表示
因式分解(a-b)^2*(a+b)-(a-b)^3
a-b\a+b=1\2时,求代数式a+b\3(a-b) - a-b\2(a+b)
[(2a+b)(2a+b)+(2a+b(b-2a)-6b]/2b a=-1/2 b=3
(-a+2b)+(2a-3b)
(a-2b)(a+3b)等于