ta co ;a+b = ab=>a=ab-b=>a=b(a-1)
a+b=a/b=>a/bthay a=b(á-1)vào vế phải
=>a+b=b(a-1)/b=a-1
a+b=a-1=>b=-1 Tacoa+b =ab thay b=-1 ta co a+-1=-1a=>a-1=-a =>2a=-1=>a=-1/2
vay b =-1 a=-1/2
tim b biet
a+b=ab=a/b
tim UCLN (ab,a+b) biet UCLN (a,b)=1
Tim a va b biet a+b=ab=a:b(b khac 0)
tim a;b;c >o biet ab=3/5; bc=4/5; ca=3/4. Tim a;b;c
Tim b biet: a+b=ab=\(\frac{a}{b}\)
a, Cho F(x) = a x+b . Tim a,b biet f(0) = 3 va F(2) =-1
b, Cho F(x) =a x+ b. Tim a,b biet F(1) = -1 va F(-2) = 8
c, Cho F(x) =a x +b .tim a,b biet F(0) = 1 va F(-2) = -9
Bai 1:tim a,b biet a/b=4/5 va[a,b]=140
Bai 2:tim a,b biet a+b=42 va [a,b]=72
trinh bay cach giai gium cho
Tim stn a,b,c , biet abc < ab + bc + ca
a,tim AC biet AB = 5,BC=8 , GÓC B=60 độ
b,tìm AC biết BC=5,AB=3
