cminh song song co bao nhieu cach nhi
tim nhgiem da thuc sau x^2 +7x-8va 5x^2+9x+4
a,tim a biet da thuc A(x)=ax2- 1/2x +1 co 1 nghiem la -1/2
b, tim a,b cua da thuc :B(x)= ax2+bx+5 biet B(1)=6 va B(-2) = 15
c, cho da thuc C(x)= ax+b .Tim a,b biet :
x=4 la nhgiem cua C(x)va C(2)=1
mot ngoi nha co 4 cua so .mot cua rong 12dm cac cua deu co song cach deu nhau 10cm .hoi nha do co bao nhieu song cua so
phan tich da thuc sau thanh nhan tu bang cach ha bac-tách để xuất hiện ntc là (x-4)
x^4-4x^3-7x^2+22x+24
\(x^4-4x^3-7x^2+22x+24\)
\(=\left(x^4-4x^3\right)-\left(7x^2-28x\right)-\left(6x-24\right)\)
\(=x^4.\left(x-4\right)-7x.\left(x-4\right)-6.\left(x-4\right)\)
\(=\left(x-4\right).\left(x^4-7x-6\right)\)
Tham khảo nhé~
de da thuc x4-5x2 +a chia het cho da thucx2-3x+2 thi a bang bao nhieu
1)tinh so hoc sinh cua mot to biet co 120 cach xep hoc sinh to do thanh mot hang doc.
2)mot to co 16 hoc sinh 8 nam 8 nu . co bao nhieu cach sap xep 16 hoc sinh do thanh mot hang doc.3)cho hai duong thang song song d1, d2. tren d1 co 10 diem phan biet, tren d2 co n diem phan biet (n>1). biet co 2800 tam giac co dinh la cac diem da cho. tim n.4)cho tam giac ABC tren canh AB lay n diem tren canh BC lay m diem tren canh CA lay k diem khong trung voi ba dinh A,B,C. hoi co bao nhieu tam giac voi dinh la cac diem do.c1) có 5 hs.
c2)có 16! = 8!*8!*16c8 cách
giai chi tiet giup minh may bai nay nha . minh cam on nhiu
1. cho hinh thang can ABCD (AB song song CD) . ke duong cao AE cua hinh thang. Biet AB=15 cm, CD =26 cm. Do dai doan DE la ? cm
2.gia tri cua x3+y3-9x-54=0
3. tu 0 den 6 co the viet duoc bao nhieu chu so tu nhien co 2 chu so khac nhau
4. voi moi x, gia tri cua bieu thuc (x+1)3-(x+1)3+6(x+1)(x-1)
phan tich da thuc sau thanh nhan tu
x^3+3x^2+4x+2
6x^4-x^3-7x^2+x+1
giup minh nhe cam on nhieu
\(a.x^3+3x^2+4x+2\)
\(=x^3+x^2+2x^2+2x+2\)
\(=x^2\left(x+1\right)+2x\left(x+1\right)+2\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2+2x+2\right)\)
\(b.6x^4-x^3-7x^2+x+1\)
\(=6x^4-6x^3+5x^3-5x^2-2x^2+2x-x+1\)
\(=6x^3\left(x-1\right)+5x^2\left(x-1\right)-2x\left(x-1\right)-\left(x-1\right)\)
\(=\left(x-1\right)\left(6x^3+5x^2-2x-1\right)\)
\(=\left(x-1\right)\left(6x^3+6x^2-x^2-x-x-1\right)\)
\(=\left(x-1\right)\left[6x^2\left(x+1\right)-x\left(x+1\right)-\left(x+1\right)\right]\)
\(=\left(x-1\right)\left(x+1\right)\left(6x^2-x-1\right)\)
\(=\left(x-1\right)\left(x+1\right)\left(6x^2-3x+2x-1\right)\)
\(=\left(x-1\right)\left(x+1\right)\left[3x\left(2x-1\right)+\left(2x-1\right)\right]\)
\(=\left(x-1\right)\left(x+1\right)\left(2x-1\right)\left(3x+1\right)\)
k giùm cái cho đỡ buồn!
Cho 2 da thuc :
P(x)=x^4+ax^2+1 va Q(x)=x^3 +ax+1
Hay xac dinh a de 2 da thuc tren co nghiem chung ( giai theo cach lop 7 nha )
bai 1: cho cac da thuc
f(x)= x^5-3x^2+7x^4-x^5+2x^2-9x^3+x^2-1/4x+2x-3
g(x)=5x^4-x^5+1/2x^4+x^5+x^2-4x^4-2x^3+3x^2+x^3-1/4
a, thu gon va sap xep cac da thuc tren theo luy thua giam dancua ien
b,tinh f(1);f(-1); g(1); g(-1)
c,tinh f(x)+g(x);f(x)-g(x)