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cho do thi cua ham so y=(m-\(\frac{1}{2}\) )x(m la hang so khac 0) di qua A(2,-4)
xac dinh m
cho don thuc 3(a+1/a)x^4y^2 voi a la hang so ,a khac 0
a)tim a de da thuc luon khong am voi moi x,y
b)tim a de da thuc luon khong duong voi moi x,y
tinh tong : 2xy + 2bxy ( b la hang so khac 0 )
Em muonn hoi la ( -1 phan 3 ax2y3)2 va N= (-3a3x3y)3 (a: hang so khac 0)
Cho minh hoi bai nay. Chi can tra loi 1 cau cung duoc! Tick cho ai tra loi som nhat, day du nhat.
1. Cho so huu ti y=2a-1/-3. Voi gia tri nao cua a thi y la so duong, y la so am, khong phai so duong cung phai so am?
2. Cho so huu ti x=a-5/a (a khac 0). Voi gia tri nao cua a thi x la so nguyen?
3. Cho so huu ti x=a-3/2a (a khac 0). Voi gia tri nao cua a thi x la so nguyen?
tim a, b la 2 so huu ti sao cho a+b=a/b=a*b va b khac 0
Cho tam giác ABC (AB<AC:góc ABC khac 90 do)I la trung diem BC,Duong trung truc BCcat AC tại N.Tren tia BN lay BM=AC (N nam giua B va M)
a) CMR:AM song song BC
b)AB cat MC tai O. CMR ;3 diem O,N,I thang hang
co 3 kho hang A,B,C chua 1 so gao. Neu nhap vao kho A them 1/7 so gao cua kho do, xuat o kho B 1/9 so gao o kho do, xuat o kho C 2/7 so gao o kho do. Khi do so gao cua 3 kho bang nhau. Tinh so gao o moi kho biet luc ban dau kho B nhieu hon kho A la 20 ta gao
cho tam giac abc goi m la trung diem cua bc. tu a ke ad song song voi bm sao cho ad=bm. d va b nam khac phia so voi canh ab
a, chung minh di=im ( dm cat ab tai i) roi suy ra m,i,d thang hang
b, chung minh bd song song voi am