Tim gia tri cua A,b biet
A^2-2a+6b+b^2=-10
tinh gia tri cua a,b biet_ 2a+6b+b2=-10
cho biểu thức A= a^3 +2a^2-1/a^3 +2a^2+2a+1
a, rut gon bieu thuc
b, CMR neu A la so nguyen thi gia tri cua bieu thuc tim duoc cua cau a la 1 phan so toi gian
Tim x de gia tri cua bt. sau
A) 3x2 +3x nhan gia tri dương , gia tri âm
B) (x+10) . (8—x) nhan gia tri dương , gia tri am
cho biểu thức A= a^3 +2a^2-1/a^3 +2a^2+2a+1
a, rut gon bieu thuc
b, CMR neu A la so nguyen thi gia tri cua bieu thuc tim duoc cua cau a la 1 phan so toi gian
tu 10 chu so :0,1,2,3,4,.....,9 hay ghep thanh 5 so co 2 chu so roi cong chung lai
a,tim gia tri lon nhat cua tong
b,tim gia tri nho nhat cua tong
cho phan so B=-10/5n-3
a)tim n de B co gia tri nguyen
b)tim gia tri lon nhat cua B
tim gia tri cua m trong 2a/b+c=2b/a+c=2c/a+b=m
\(\frac{2a}{b+c}=\frac{2b}{a+c}=\frac{2c}{a+b}=\frac{2\left(a+b+c\right)}{2\left(a+b+c\right)}\)=1
vậy m=1
Cho A=3+3^2+3^3+3^4+...+3^100
a, tinh gia tri cua A
b, Chung to A chia het cho 10
c, tim so du cua A khi chia cho 13
d, tim x 2A-3=3^x+100
e, 2A co phai la so chinh phuong khong
dag can gap
tim gia tri nho nhat cua
a^4-2a^3+3a^2-4a+5