Các câu hỏi tương tự
Cho ba don thuc:\(M=-5xy\),\(N=11xy^2\),\(P=\frac{7}{5}x^2y^3\).Chung minh rang ba don thuc nay khong the cung co gia tri duong.
a)Cho vi du ve 1 don thuc ,1 da thuc nhung khong phai la don thuc ,2 don thuc dong dang voi nhau ,da thuc 1 bien
b)Hay viet 1 don thuc dong dang voi don thuc don thuc xy\(^3\) sao cho tai x=-1 y=2 gia tri cua don thuc do la so nguyen duong nho hon 10
bai 1: Cho cac don thuc A=-4/9x^3y va B= 3/8 x^5y^3. Tim cac cap gia tri (x;y)de A,B cung gia tri am
bai 2: viet don thuc B=64xy^12 duoi dang luy thua cua 1 don thuc voi so mu khac 1
bai 3: cho A=8x^5y^3; B=-3x^6y^3; C=-6x^7y^2. CM: Ax^2+Bx+C>0
cho da thuc P = (-2/3x^3y^2)(1/2x^2y^5) a) thu gon da thuc P roi xac dinh he so va phan bien cua don thuc ?
b) tinh gia tri cua P tai x = -1 , y =1
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
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
dang I. Tim gia tri bieu thucBai 5: Cho x - y 9, tinh gia tri cua bieu thucBfrac{4x-9}{3x+y}-frac{4y+9}{3y+x}(x khac -3y, y khac -3x)Bai 6: Hay viet cac da thuc duoi dang tong cua cac don thuc roi thu gon. tinh gia tri bieu thuc khi x-1, y1a,D4x(x+y)-5y(x-y)-4x^2 b,E(a-1)(x^2+1)-x(y+1)+(x+y^2-a+1)moi nguoi giup minh di hu hu
Đọc tiếp
dang I. Tim gia tri bieu thuc
Bai 5: Cho x - y =9, tinh gia tri cua bieu thuc
B=\(\frac{4x-9}{3x+y}\)-\(\frac{4y+9}{3y+x}\)(x khac -3y, y khac -3x)
Bai 6: Hay viet cac da thuc duoi dang tong cua cac don thuc roi thu gon. tinh gia tri bieu thuc khi x=-1, y=1
a,D=4x(x+y)-5y(x-y)-4x\(^2\) b,E=(a-1)(x\(^2\)+1)-x(y+1)+(x+y\(^2\)-a+1)
moi nguoi giup minh di hu hu
1.Tan so cua mot gia tri la gi?Co nhan xet gi ve tong cac tan so?
2.Cho mot so vi du ve don thuc
3.Hay viet mot da thuc va chi ro cac hang tu cua da thuc do
4.Viet hai da thuc roi tinh tong cua chung
5.Tinh
a,(x+y)+(x-y) b,(x+y)-(x-y)
hay viet cac don thuc voi bien x,y va co gia tri bang 9 tai x=-1 va y=1