(1)3a^2-2a+1-a^2+5a-6(2) (4x-3y)-(-(3y-x)+(x-y))-5x(3)(m+3)(m-3)^2(4)(a^2+9)^2-(a+3)(3-a)(a^2+9)(5)(-x^2×x^5)^2÷(-x^2)^3（6）2×2^n÷2^n-1 -(-1又二分之一)^8×(1/3)^8×(-2)^10因式分解：（1）x^3-2x^2+xy^2(2)a^2-b^2+2b-1希望在 8：50

(1)3a^2-2a+1-a^2+5a-6(2) (4x-3y)-(-(3y-x)+(x-y))-5x(3)(m+3)(m-3)^2(4)(a^2+9)^2-(a+3)(3-a)(a^2+9)(5)(-x^2×x^5)^2÷(-x^2)^3（6）2×2^n÷2^n-1 -(-1又二分之一)^8×(1/3)^8×(-2)^10因式分解：（1）x^3-2x^2+xy^2(2)a^2-b^2+2b-1希望在 8：50
(1)3a^2-2a+1-a^2+5a-6
(2) (4x-3y)-(-(3y-x)+(x-y))-5x
(3)(m+3)(m-3)^2
(4)(a^2+9)^2-(a+3)(3-a)(a^2+9)
(5)(-x^2×x^5)^2÷(-x^2)^3
（6）2×2^n÷2^n-1 -(-1又二分之一)^8×(1/3)^8×(-2)^10
因式分解：
（1）x^3-2x^2+xy^2
(2)a^2-b^2+2b-1
希望在 8：50分前做出来,超过时间就没了
速度快正确率高的 我再加50分
那道题我没抄错，本子上就是这么写的

(1)3a^2-2a+1-a^2+5a-6(2) (4x-3y)-(-(3y-x)+(x-y))-5x(3)(m+3)(m-3)^2(4)(a^2+9)^2-(a+3)(3-a)(a^2+9)(5)(-x^2×x^5)^2÷(-x^2)^3（6）2×2^n÷2^n-1 -(-1又二分之一)^8×(1/3)^8×(-2)^10因式分解：（1）x^3-2x^2+xy^2(2)a^2-b^2+2b-1希望在 8：50
(1)3a^2-2a+1-a^2+5a-6
= 2a^2+3a-5
(2)(4x-3y)-(-(3y-x)+(x-y))-5x
=4x-3y-(-3y+x+x-y)-5x
=4x-3y-(-4y+2x)-5x
=4x-3y+4y-2x-5x
=y-3x
(3)(m+3)(m-3)^2
=(m+3)(m-3)(m-3)
=(m^2-9)(m-3)
=m^3-3m^2-9m+27
(4)(a^2+9)^2-(a+3)(3-a)(a^2+9)
=(a^2+9)[(a^2+9)-(a+3)(3-a)]
=(a^2+9)[(a^2+9)+(a^2-9)]
=(a^2+9)(2a^2)
=2a^4+18a^2
(5)(-x^2×x^5)^2÷(-x^2)^3
= (-x^7)^2÷(-x^6)
= x^14÷(-x^6)
= -x^8
（6）2×2^n÷2^n-1 -(-1又二分之一)^8×(1/3)^8×(-2)^10
= 2×2^n÷2^n-1 -(-3/2)^8×(1/3)^8×(-2)^10
= 2×2 -(-3/2×1/3)^8×(-2)^10
= 4 -(-1/2)^8×(-2)^10
= 4 -(1/2^8)×2^10
= 4 -2^2
= 0
(1）x^3-2x^2+xy^2
= x(x^2-2x+y^2)
(2)a^2-b^2+2b-1 无法分解,请检查原题

2k

那么简单，你只要是人就会做，第6题还有一丁点难度

=2a^2+3a-5 = (a-1)(2a+5)
=y-3x
=m^3-9m-3m^2+27
=(a^2-8)(a^2+9) =a^4+a^2-72
=-x^8
=-3
=x(x^2-2x+y^2)
=(a+b-10(a-b+1)

1)3a^2-2a+1-a^2+5a-6
= 2a^2+3a-5
(2)(4x-3y)-(-(3y-x)+(x-y))-5x
=4x-3y-(-3y+x+x-y)-5x
=4x-3y-(-4y+2x)-5x
=4x-3y+4y-2x-5x
=y-3x
(3)(m+3)(m-3)^2
=(m+3)(m-3)(m-3)
=(m^2...

全部展开

1)3a^2-2a+1-a^2+5a-6
= 2a^2+3a-5
(2)(4x-3y)-(-(3y-x)+(x-y))-5x
=4x-3y-(-3y+x+x-y)-5x
=4x-3y-(-4y+2x)-5x
=4x-3y+4y-2x-5x
=y-3x
(3)(m+3)(m-3)^2
=(m+3)(m-3)(m-3)
=(m^2-9)(m-3)
=m^3-3m^2-9m+27
(4)(a^2+9)^2-(a+3)(3-a)(a^2+9)
=(a^2+9)[(a^2+9)-(a+3)(3-a)]
=(a^2+9)[(a^2+9)+(a^2-9)]
=(a^2+9)(2a^2)
=2a^4+18a^2
(5)(-x^2×x^5)^2÷(-x^2)^3
= (-x^7)^2÷(-x^6)
= x^14÷(-x^6)
= -x^8
（6）2×2^n÷2^n-1 -(-1又二分之一)^8×(1/3)^8×(-2)^10
= 2×2^n÷2^n-1 -(-3/2)^8×(1/3)^8×(-2)^10
= 2×2 -(-3/2×1/3)^8×(-2)^10
= 4 -(-1/2)^8×(-2)^10
= 4 -(1/2^8)×2^10
= 4 -2^2
= 0
因式分
(1）x^3-2x^2+xy^2
= x(x^2-2x+y^2)
第二小题，题抄错了

收起