随堂练习把下列因式分解:x[a加b]加[a加b],3a[x减y]减[x减y]
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原式=(y-x)(a-b+c-b+a+c)=2*(y-x)(a-b+c)
(a-b)+4(b-a)=(a-b)-4(a-b)=-3(a-b)
9a²-4(b+c)²=(3a+2b+2c)(3a-2b-2c)
1、选C平方差公式2、(1)4m-12m³=4m(1-3m²)=4m(1+√3m)(1-√3m)(2)4xy³-8x²y²+4x³y=4xy
-3a(1-x)-2b(x-1)+c(1-x)=(x-1)(3a-2b-c)
4xy²-4x²y-y³=-y(4x-4xy+y²)=-y(2x+y)²
1.x(x-y)^2-y(y-x)^2=(x-y)^2*(x-y)=(x-y)^32.18(a-b)^3-12b(b-a)^2=(a-b)^2*(18a-18b-12b)=6(a-b)^2*(3a-5
(3X+2Y)(3X-4Y)+9Y的平方=9x^2-6xy-8y^2+9y^2=9x^2-6xy+y^2=(3x-y)^2
1.用平方差公式:(z²-x²-y²)²-4x²y²=[(z²-x²-y²)-2xy][(z²-x&
a^2-81=(a-9)(a+9)x^2-6x+9=(x-3)^2
(2m+3n)(2m-n)-4n(2m-n)=(2m-n)(2m+3n-4n)=(2m-n)(2m-n)=(2m-n)^2(x+y)^2(x-y)+(x+y)(y-x)^2=(x+y)(x-y)(x+
最后是几次方?追问再问:3再答:原式=1/2a²(x-2a)²+1/4a(x-2a)³=1/4a[2a+(x-2a)]=1/4ax
1.5a平方2b(x-y)的六次方-30ab2(y-x)平方=10a²b(x-y)^6-30ab²(x-y)²=10ab(x-y)²[a(x-y)^4-3b]2
原等式=3a²-3ab-5ab-5b²=3a²-8ab-5b²
9-6(a+b)+(a+b)的平方=[3-(a+b)]^2=(3-a-b)^2
(1)4x²-20xy+25y²=(2x)²-2*2x*5y+(5y)²=(2x-5y)²(2)9-12(x-y)+4(x-y)²=3
1、9a²-4b²=(3a)²-(2b)²=(3a+2b)(3a-2b)2、4x²-25y²=(2x)²-(5y)²=(
(1)(a²+1)(a+1)(a-1)(2)(3x-2)(3x-4)(3)(x+2)(x-2)(1-2x)(4)x(2y-3z)²(z+y)(z-y)
一解:(1)原式=(x-1)(7x-7+4)=(x-1)(7x-3)(2)原式=(a-b)(x-y)(3)原式=(p-3)(6m-4n)(4)原式=(y+2)(1-20y-40)=(y+2)(-20y