Các câu hỏi tương tự
+Tim x thuoc N, biet :
a/ x+(x+1)+(x+2)+....+(x+30)=1240
b/1+2+3+........+x=210
tim a,b biet
1/a-1/b=1/a-b(a,b>o)
tim x , biet
a) 3 - x = 4
b) 7 + x = 5
tim mot so biet so do cong voi 10 roi tru 20 roi lai cong voi 60 thi bang 90 so do la ...
tim x biet x - 3 = 5
cho 3 chu so a,b,c, thoa man :0<a<b<c
a/viet tap hop A cac so tu nhien co ba chu so gom ca ba chu so a,b,c.
b/biet tong hai so nho nhat trong tap A bang 488. Tim 3 chu so a,b,c noi tren
tim x biet x + 3 = 8
tim x,y biet (x+1)(x-y)=5
tim 3 gia tri cua y,biet 11<y<12