NHan cac don thuc sau va tim bac va he so cua don thuc nhan duoc:
(\(\frac{1}{3}\)x\(^3\)y).(-xy)\(^2\)
NHan cac don thuc sau va tim bac va he so cua don thuc nhan duoc:
(\(\frac{1}{3}\)x\(^3\)y).(-xy)\(^2\)
NHan cac don thuc sau va tim bac va he so cua don thuc nhan duoc:
(\(\dfrac{1}{3}\)x\(^3\)y).(-xy)\(^2\)
\(\left(\dfrac{1}{3}x^3y\right)\left(-xy\right)^2=\left(\dfrac{1}{3}x^3y\right).x^2y^2=\dfrac{1}{3}x^5y^3\)
Bậc: 5
Hệ số: \(\dfrac{1}{3}\)
(2x²y)²nhan 3phan4 xy²
a,thu gon don thuc va tim bac cua don thuc tren
cho don thuc A=19/5 xy^2(x^3y)(-3x^13y^5)^0
a, thu gon don thuc A
b, tim he so va bac cua don thuc
c, tinh gia tri cua don thuc tai x=1, y=2
a: \(A=\dfrac{19}{5}xy^2\cdot x^3y=\dfrac{19}{5}x^4y^3\)
b: Hệ số là 19/5 và bậc là 7
c: Khi x=1 và y=2 thì \(A=\dfrac{19}{5}\cdot1^4\cdot2^3=\dfrac{19}{5}\cdot8=\dfrac{152}{5}\)
Cho don thuc A=(-2xy)-4/5x^2y^3 a,Thu gon don thuc tren ,cho biet phan he so va phan bien ,tim bac cua don thuc b,Tinh gia trim cua don thuc tai x=1,y=-1
a, P=-3(x^3.x)(y^2.y^3)
=-3x^4y^5
b, Thay x=-1 , y=2 vào đơn thức P . Ta có :
P=-3.(-1)^4.2^5
P=3.1.32
P=96
Cho don thuc A=(-2xy)-4/5x^2y^3 a,Thu gon don thuc tren ,cho biet phan he so va phan bien ,tim bac cua don thuc b,Tinh gia trim cua don thuc tai x=1,y=-1
THU GON DON THUC SAU VA CHO BIET PHAN HE SO ,PHAN BIEN CUA DON THUC THU DUOC
-AX(xy^3).1/4.(-by)^3 (voi a,b la hang so)
cac ban oi giup minh voi
thu gon cac don thuc va chi ra phan he so cua chung 5x mu 2 nhan 3xy mu 2
Ta có: 5x2.3xy2 = (5.3).(x2.x).y2 = 15x3y2
Phần hệ số: 15
A=1/3(xy^2)^2.(1/2x^2y)^2.4/5.x^3
B=-2x^4y.1/4x^2.y^2.(-2xy)^3
Thu gon da thuc tren
Xac dinh he so ,bac cua cac don thuc vua thu gon
Tinh A+B va A-B