cho biet 35 cong nhan xay xong mot ngoi nha het 168 ngay,nang suat cua cac cong nhan nhu nhau.
So cong nhan (nguoi) | 7 | 8 | 20 | 21 | 28 |
Thoi gian xay (ngay) |
b cac dai luong tren co ti le nghich voi nhau khong?
c tim cong thuc bieu thi lien he giua cac dai luong do?
d tim he so ti le?
Tim n nguyen de bieu thuc co gia tri nguyen :
A= \(\dfrac{3n+1}{n+1}\) ( voi n khac -1)
Tim GTNN cua bieu thuc A=|x-2|+|x-10|
cho x+y=3. tim gt nho nhat cua bieu thuc |x+1|+|y-2|
tinh gia tri bieu thuc tai x=1 y=-1 z=3
xyz+2x^2y/y^2+1
tinh gia tri bieu thuc cua dai so x2y3 +xy tai x=1 va y=1/2
Tim gia tri nho nhat cua bieu thuc :
a)A=\(\left|x+5\right|+2-x\)
b)B=\(\left|x-1\right|+x+6\)
Tim cac GTNN cua cac bieu thuc sau
a/ \(^{\left(x-3\right)^2+2}\)
Tinh gia tri bieu thuc : (3.2^20+7.2^19).52/(13.8^4)^2