先分解因式,再计算求值:3x的平方(a 3)
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601920119:(1)9x²+12xy+4y²=(3x)²+12xy+(2y)²=(3x+2y)²=[3×(3/4)+2×(-1/2)]²
X(X+2)(X-2)
3x2(a+3)-4x2y(a+3)=x2(a+3)(3-4y),当a=-0.5,x=3,y=1时,原式=32×(-0.5+3)×(3-4×1)=-22.5.
(x+3)(x-1)
解题思路:非负数的和等于0,可解解题过程:已知x2+y2+z2-2x+4y-6z+14=0,求x+y+z的值.解:∵x2+y2+z2-2x+4y-6z+14=0x²-2x+1+y²+4y+4+x²-6
x³+3x²-4=x³-x²+4x²-4=x²(x-1)+4(x²-1)=x²(x-1)+4(x+1)(x-1)=x&s
原式=x²(a+3)(3-4y)=9*(5/2)*(-1)=-45/2
12m(x+y)的3次方-9n(x+y)的平方=3(x+y)²(4mx+4my-3n)如果本题有什么不明白可以追问,
f(x)=8x^3(x-3)+12x^2(3-x)=4x^2(x-3)(2x-3)x=1.5f(1.5)=4(1.5)^4(1.5-3)(2(1.5)-3)=0
xyz^2+xy^2z+x^2yz=(xyz)(x+y+z)=(2/5*17/20*3/4)(2/5+17/20+3/4)=51/200*40/20=51/100
9x的二次方+12xy+4y的二次方=(3x+2y)^2=[3*4/3+2*(-1/2)]^2=(4-1)^2=9
2^2011-2^2010=2^2010*(2-1)=2^2010*1=2^2010b=-3+2=-1c=-3*2=-6
(1)xy-6xy+9xy=xy(x-6xy+9y)=xy(x-y)(2)(a+4b)-16ab=(a+4b)-(4ab)=[(a+4b)-4ab][(a+4b+4ab)]=(a-4ab+4b)(a+
原式=3x(x²-2xy+y²)=3x(x-y)²=3×5/6×(5/6+1/6)²=5/2
给你过程:4x(m-2)-3x(2-m)=4x(m-2)+3x(m-2)7X(M-2)=7*1.5(6-2)=10.5*4=42
x3﹙m-2﹚+4x﹙2-m﹚,=x³(m-2)-4x(m-2)=x(m-2)(x²-4)=x(m-2)(x+2)(x-2)当x=0.4,m=2时原式=0.4×3.5×2.4×(-
4x(m-2)-3x(m-2)=(m-2)(4x-3x)=x(m-2)=1.5×(6-2)=6
当x=-√3时,原式=3-5=-2
XYZ^2+XY^2Z+X^2YZ提取公因式XYZ=XYZ(Z+Y+X)代入数字后:(2/5)*(7/20)*(1/4)(7/20+2/5+1/4)=7/200年轻人第二题29^9应该是27^9吧【如
(x+y)^3(x-y)-(x+y)(x-y)^3=(x+y)(x-y)[(x+y)^2-(x-y)^2]=(x+y)(x-y)(x+y+x-y)(x+y-x+y)=4xy(x+y)(x-y)