=>\(\frac{a}{17}\)=\(\frac{b}{19}\)=\(\frac{a-b}{17-19}\)=\(\frac{72}{-2}\)=-36
=>a=-36.17=-612
=>b=-36.19=-684
=>\(\frac{a}{17}\)=\(\frac{b}{19}\)=\(\frac{a-b}{17-19}\)=\(\frac{72}{-2}\)=-36
=>a=-36.17=-612
=>b=-36.19=-684
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
tim 2 stn a va b biet a+b=42 va bcnn(a;b)=72 (a<b)
tim 2 stn a va b (a<b) biet a+b =42 va BCNN(a;b) = 72 vay a; b =
Tim 2 so a va b biet UCLN(a,b)=12;BCNN(a,b)=72
Tim tat ca cac so tu nhien a va b biet
a) a . b = 72 va ( a > 6 )
b) a . ( b - 3 ) = 15
c) ( a - 1 ) . ( b + 2 ) = 9
Tim a, b \(\in\)N biet a + b = 42 va (a,b) =72
1) ket qua cua phep chia abba:(91a+10b)
2) tim 2 stn a b (a<b) biet a+b=42 va BCNN(a;b)=72
tim 2 so tu nhien a,b (a<b) biet : BCNN(a,b) =120 va UCLN(a,b)=19
a) tim so tu nhien nho nhat biet rang so do chia het cho 9 du 5, chia cho 7 du 4 va chia cho 5 thi du 3
b) cho A = 1+2017+20172+20173+20174+. . .+201771+201772 va B = 201773-1. So sanh A va B.
c) tim hai so tu nhien a va b, biet : BCNN (a, b) = 300 , UCLN (a, b) = 15 va a+15 = b.
Giup minh giai di nha. Cam on may ban nha