Các câu hỏi tương tự
Cho a,b,c thuoc N va a khac 0.Chung to rang bieu thuc P luon am,biet rang:
P=a(b-a)-b(a-c)-bc
Cho tam giac ABC.Tu trung diem D cua canh BC,Ke duong vuong goc voi phan giac cua goc A cat AB tai M,AC tai N
a)Chung minh :BM=CN
b)Biet AB=C,AC=B .TINH AM,BM(gia su B>C) theo a va b
CAC BAN VE HINH HO MINH LUON NHA
cho A = 1/15 nhan 225/(8+2) + 3/14 nhan 196/(3x+6) (x thuoc Z; x khac -2 )
a) Rut gon A
b) Tim x thuoc Z de A thuoc Z
c) trong cac gia tri nguyen A tim gia tri lon nhat va gia tri nho nhat
cho a va b la hai so nguyen khac dau. khi do gia tri tuyet doi cua a nhan gia tri tuyet doi cua b = k.a.b. vay k =?
Cho cac bieu thuc
A=n+6 phan n-5 va B=3n-9 phan n-6
a/ Tim gia tri nguyen cua n de A, B la phan so ?
b/ Tim gia tri nguyen cua n de A, B co gia tri nguyen?
c/ Tim gia tri nguyen cua n de A, B co gia tri nguyen lon nhat?
1)CMR:(a+b-c)+(a-b)-(a-b-c)=a+b
2)chung minh A va B la hai so doi nhau biet:A=a-b+c;B=-a+b-c
3)cho a-b=1.tinhS biet :
S=-(a-b-c)+(-c+b+a)-(a+b)
ai lam duov 5 tick luon
bai 10
cho a,bc la so tu nhien khac 0va S=a+b/c+b+c/a+c+a/b>=6
tim gia tri nho nhat cua s
minh can truoc gio 15 cac ban lam ho minh nhe
thanh you
Cho hai tia doi nhau Ot va Ot'. Tren tia Ot lay 2 diem A va B sao cho OA=2cm; OB=5cm.Tren tia Ot' lay diem C sao cho OC=a cm . Tim gia tri cua a de A la trung diem cua BC
( Cho mik biet cach giai nua nha!
cho a=5 vva b-c=20 va a=b(a-c)-c(a-b) gia tri bieu thuc cua a la