初一因式分解练习题300道300道,我真的很着急,(x+2)(x-3)+(x+2)(x+4)150道就行冀教版
初一因式分解练习题300道
300道,
我真的很着急,
(x+2)(x-3)+(x+2)(x+4)
150道就行
冀教版
初一因式分解练习题300道300道,我真的很着急,(x+2)(x-3)+(x+2)(x+4)150道就行冀教版
初一因式分解练习题300道
300道,
我真的很着急,
(x+2)(x-3)+(x+2)(x+4)
150道就行
冀教版
(1)a的四次方+a²+1
=a^4+2a²+1-a²
=(a²+1)²-a²
=(a²+a+1)(a²-a+1)
(2)2a²-7ab+6b²
=(2a-3b)(a-2b)
(3)3x²+xy-2y²
=(3x-2y)(x+y)
(4)10a²b²+11ab-6
=(2ab+3)(5ab-2)
(5)7a³x-28a(x的五次方)
=7a³(x-4a²)
(6)x³-10x²+16x
=x(x²-10x+16)
=x(x-2)(x-8)
(7)(x²+3x)²-2(x²+3x)-8
=(x²+3x+2)(x²+3x-4)
=(x+1)(x+2)(x+4)(x-1)
(8)(x-y)²+4xy-1
=x²-2xy+y²+4xy-1
=x²+2xy+y²-1
=(x+y)²-1
=(x+y+1)(x+y-1)
9.x^2-4xy+4y^2-x+2y-2
=(x-2y)^2-(x-2y)-2
=(x-2y+1)(x-2y-2)
10.x³+ax²+bx²+cx²+abx+bcx+acx+ab
=x³+cx²+abx+abc+bx²+bcx+ax²+acx
=x²(x+c)+ab(x+c)+bx(x+c)+ax(x+c)
=(x+c)[x²+bx+ab+ax]
=(x+c)[x(x+b)+a(x+b)]
=(x+a)(x+b)(x+c)
11.x²-y²-y-1/2
=x²-(y²+y+1/4)
=x²-(y+1/2)²
=(x+y+1/2)(x-y-1/2)
12.x的四次方+3x³+6x²-4
=x^4+x³+2x³+2x²+4(x²-1)
=x³(x+1)+2x²(x+1)+(4x-4)(x+1)
=(x+1)(x³+2x²+4x-4)
13.x³-3x²+4
=x³+1-3(x²-1)
=(x+1)(x²-x+1)-(3x-3)(x+1)
=(x+1)(x²-4x+4)
=(x+1)(x-2)²
14.32a[(x^2+2x)^2]-2a
=2a[16(x^2+2x)^2-1]
=2a(4x^2+8x+1)(4x^2+8x-1)
15.16+8(x^2+4x)+(x^2+4x)^2
=(4+x^2+4x)^2
=(x^2+4x+4)^2
=(x+2)^4
16.3x^ny+9x^(n-1)y^2+x^(n+1)/4
=x^(n-1)(3xy+9y^2+x^2/4)
=x^(n-1)(x^2/4+3xy+9y^2)
=x^(n-1)(x/2+3y)^2
=(1/4)[x^(n-1)](x+6y)^2
17.a^4+a³+3a-5
=a²*(a²+a)+3a-5
=3a²+3a-5
=3(a²+a)-5
18.1+x+x(x+1)+x(x+1)^2+x(x+1)^3
=(1+x)+x(x+1)+x(x+1)^2+x(x+1)^3
=(1+x)(1+x)+x(x+1)^2+x(x+1)^3
=(1+x)²(1+x)+x(x+1)^3
=(1+x)³(1+x)
=(1+x)^4
19.(x-y)(2x-2y-3)-2
=(x-y)[2(x-y)-3]-2
=2(x-y)^2-3(x-y)-2
=[(x-y)-2][2(x-y)+1]
=(x-y-2)(2x-2y+1).
x2-3xy-10y2+x+9y-2=(x-5y+2)(x+2y-1).
x2-y2+5x+3y+4=(x+y+1)(x-y+4).
xy+y2+x-y-2=(y+1)(x+y-2).
6x2-7xy-3y2-xz+7yz-2z2=(2x-3y+z)(3x+y-2z).
a^2+2b^2+3c^2+3aB+4ac+5bc=(a+b+c)(a+2b+3c)
x^2-8x+7=(x-1)(x-7)
X^2+8X+7=(x+1)(x+7)
X^2-10X-11=(x-11)(x+1)
x^2+10X-11=,(x+11)(x-1)
X^+3x-18=(x+6)(x-3)
x^2+11X+18=(x+2)(x+9)
x^2-11x+18=(x-2)(x-9)
x^2+17X-18=(x+18)(x-1)
X^2-17X-18=(x-18)(x+1)
xy+6-2x-3y=(x-3)(y-2)
x2(x-y)+y2(y-x)=(x+y)(x-y)^2
2x2-(a-2b)x-ab=(2x-a)(x+b)
a4-9a2b2=a^2(a+3b)(a-3b)