(2x 3y)(4x 7y)因式分解
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(3x+2)^2=4(x-3)^2(3x+2)^2-4(x-3)^2=0(3x+2+2x-6)(3x+2-2x+6)=0(5x-4)(x+8)=0x=4/5或x=-8
x²-y²-x+1/4=(x²-x+1/4)-y²=(x-1/2)²-y²=(x-y-1/2)*(x+y-1/2)
(1)原式=xy(x2-y2)=xy(x+y)(x-y);(2)原式=(x2+1-2x)(x2+1+2x)=(x-1)2(x+1)2;(3)原式=x−yx÷(x−y)2x=x−yx×x(x−y)2=1
原式=4x29y2•27y364x3•4xy=34x2.故答案为34x2.
解题思路:本题目主要考察利用因式分解的方法解答一元二次方程的方法掌握情况解题过程:
∵x+y=4,∴(x+y)2=16,∴x2+y2+2xy=16,而x2+y2=14,∴xy=1,∴x3y-2x2y2+xy3=xy(x2-2xy+y2)=14-2=12.
4x^2-(x-1)^2=0[2x-(x-1)][2x+(x-1)]=0(2x-x+1)(2x+x-1)=0(x+1)(3x-1)=0x=-1或x=1/3
再答:看看可以不再答:看看可以不再问:嗯,谢谢再答:不会了来问我啊,当年哦高考考了138
4X-2Y=16P4X+7Y=7P-9Y=9PY=-P3X+7P=35X=3.5P17.5P=35P=2
(2x4-4x3y-x2y2)-2(x4-2x3y-y3)+x2y2=2x4-4x3y-x2y2-2x4+4x3y+2y3+x2y2=2y3,因为化简的结果中不含x,所以原式的值与x值无关.
(2x-1)(2x-1)=0再答:x=1/2
常数项就是不带有字母的项,所以这个式子中常数项是-5
x+y=4,xy=2后者平方后二式相加再加后者平方
2008^2=(2000+8)^2=4000000+2X2000X8+64=4032064
多项式2-xy2-4x3y是四次三项式,其中3次项的系数是-1,故答案为:四、三,-1.
[2(x-2)]2-[5(x+3)]2=(2x-4)2-(5x+15)2=(2x-4+5x+15)(2x-4-5x-15)=(7x+11)(-3x-19)=-(7x+11)(3x+19)=0x=-11
3x3y-12xy3,=3xy(x2-4y2),=3xy(x+2y)(x-2y).故答案为:3xy(x+2y)(x-2y).
1)4/9p²q²-1=(2/3pq-1)(2/3pq+1)(2)25(m+n)²-9n²=[2(m+n)+3n][2(m+n)-3n]=(2m+2n+3n)(
(x-4)^2=(5-2x)^2(x-4)^2-(5-2x)^2=0(x-4+5-2x)(x-4-5+2x)=0(1-x)(3x-9)=0x=1或x=3