Ta có : -1<1 \(\Rightarrow\)x-1 <x+1 (vì x>1)
\(\Rightarrow\)\(\frac{x-1}{3}\)< \(\frac{x+1}{3}\)
\(\frac{x-1}{3}...\frac{x+1}{3}\)
Ta có :\(-1< 1=x-1=x+1\)
\(\Rightarrow\frac{x-1}{3}< \frac{x+1}{3}\)
khong quy dong tu so va mau so hay so sanh
a) 13/17 va 15/19
tim x biet
a) \(\frac{2}{3}\times x+\frac{3}{4}=3\)
b, 720:[41-(2x x-5)]=120
khong tinh hay so sanh phan so sau
\(\frac{1}{2}va\frac{34}{56}\)
y*2+y/2=10
tim x biet 1/2+1/3 <x<3-1/3
so cac phan so co mau so bang 100 va nho hon 1
so sanh hai phan so sau :
\(\frac{1999}{32001}\)va \(\frac{12}{11}\)
so sanh 2 phan so khong quy dong tu so va mau so hay so sanh phan so \(\frac{23}{48}\)va \(\frac{47}{92}\)
Tim mot phan so biet tong cua tu so va mau so la 125 va biet phan so do bang \(\frac{2}{3}\)tim phan so do.
hay .3 duong tron co duong kinh bang nhsu tren to giay trang .A,qua tam doan thang chia hinh tron 2 phan bang nhau . hay bieu thi phan so do.b, qua tam ve chia thanh 4 phan bang nhau. em hay to mau 3 phan.phan to mau chiem bao nhieu phamn hinh tron.c,chia hinh tron thanh 16 phan bang nhau va danh dau X ngau nhien 1 so o , 1 so o em to mau .hay cho biet danh dau X vao phan to mau, con lai chiem hinh tyron.,roi xep phan so va so xanh truc quan bang cach dat chung chong len nhau sau do cho biet moi quan he gia phan so
Tim hai so x,y biet hieu giua so lon va so be bang 216 don vi va x bang 1/3 y?
5. Tim X :
4 x 396 x 0. 25 : ( X + 0. 75 ) = 1. 32
6. Tim A va B biet A/B =1/6 va beu them vao moi so 18.4 thi duoc 2 so co ti so phan tram la 0. 25
7. 1 nguoi ban cam trong 3 ngay : Ngay thu hai so cam ban duoc 10% so voi ngay thu nhat. Ngay thu ba so cam ban duoc giam 10% so voi ngay thu hai . Hoi ngay thu nhat va ngay thu ba thi ngay nao nguoi do ban nhieu cam hon va nhieu hon bao nhieu % ?
