cac ban giup minh voi ,
3 ban xong dau tien se duoc minh k nhe,
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2. tim x biet
a)8/x= 40/45
b)2/5 + x/7=5/6
Bai 1: Tim ab ; biet ab = b x 9
Bai 2 : Tim ab, biet :
a) ab x 5 = 2ab b) ab = 4ab / 9.
Bai 3 : Tim ab, biet : a 2 = b x 5
Bai 4 : Tim cac so ab biet :
a) a x3 = bx9 b) a x4 = b x6.
Bai 5 :
a) Tim abc, biet a , b , c khac nhau va : a x bc = 91.
b) Tim a , b , c khac nhau biet aa x bc = 1001
2. Tim x tren y biet
a. x/y + 4/5 = 8/6
b. x/y - 4/5 = 2/3
c. 5/8 * x/y = 5/12
d. x/y : 2/9 = 3/8
tim 2 so biet rang so lon la so co 4 chu so neu xoa di chu so 5 thuoc hang nghin cua so lon thi duoc so be = 1/9 so lon
Tim a la 1 so tu nhien biet : 4<a+1<5.Tim a ?
tim hai so Y va Z biet tong hai so la 224 va ti le cua Y&Z la 5/3?
tim a biet
30/5=a/115
105/9=5/12
tim x biet 1- (5/3/8 + x - 7/5/24 ) / 16/2/3 =0
tim a biet:(a+1)+(a+2)+(a+3)+(a+4)+(a+5)=315