đổi 12,5 % =1/8
do 2/5 a=480=>a=480:2/5=1200
=>12,5%a=1200.1/8=150
số a là:
480:2\5=1200
12.5% số a là
1200.12.5:100=150
ngo mjnh hoang sai tram trong. 2.5=480 nên 12,5%phải lớn hơn 480
đổi 12,5 % =1/8
do 2/5 a=480=>a=480:2/5=1200
=>12,5%a=1200.1/8=150
số a là:
480:2\5=1200
12.5% số a là
1200.12.5:100=150
ngo mjnh hoang sai tram trong. 2.5=480 nên 12,5%phải lớn hơn 480
Biet rang : BCNN(a,b).UCLN(a,b)
a, BCNN cua hai so la 600, UCLN cua chung nho hon 10 lan BCNN. So thu 1 la 120, tim so thu 2.
b, UCLN cua hai so la 12, BCNN cua chung lon gap 6 lan UCLN . So t 1 la 24, tim so t 2
c, Tong cua hai so bang 60, tong giua UCLN va BCNN cua chung la 84. Tim hai so do.
A = 2/ x-1 .tim dieu kien cua x de A la phan so . tim A khi x = 2 ; x = -3. tim dieu kien cua x de A la so nguyen ( A thuoc Z )
ti so cua a va b la 7/5 neu them 10 don vi vao a thi ta co ti so moi cua a va b la 3/2. Tim a va b
Tim cac so a,b sao cho n= a53b vua la boi cua 5 vua la boi cua 6
Cho a la so co 2 chu so tim a biet rang tong 2 chu so cua a cong them binh phuong cua tong 2 chu so do se duoc a.
tim GTNN cua phan so\(\frac{ab}{a+b}\)(ab la so co 2 chu so)
Cho A=n+3/n+2 voi n€z
a)tim dieu kien cua so nguyen n de A la phan so
b)tinh gia tri cua phan so A khi n=1;n=-1
c)tim so nguyen n de phan so A co gia tri la so nguyen
\(A=\frac{a^3+2a^2-1}{a^3+2a^2+2a+1}\)
a)rut gon bieu thuc
b)chung minh rang neu a la so nguyen thi gia tri cua bieu thuc tim duoc cua cau a la mot phan so toi gian
Tim so nguyen duong nho nhat thoa man:mot phan 2 cua no la so ching phuong,1/3 cua no bang lap phuong cua 1 so nguyen,1/5 cua no bang luy thua bac 5 cua 1 so nguyen.