B1:so sánh : a)A=1984.1986B=19852
b)A=(xy)/(x+y)B=(X2y2)/(x2+y2) với x>y>0
c)9920999910             d)321231

B2 Tìm số nguyên n sao cho:
a)n+1 là ước của n2+7    
b)n3+1 là ước của n5+1

B3 Tìm x,y thỏa mãn phương trình 2x22xy=5x+y19    
b) Tìm x,y biết x22x+y2+4y+5=0
Câu 1: 
a 1984.1986=(19851)(1985+1)=198521<19852
b: vì x>y>0 nên xy>0
xyx+yvsx2y2x2+y2
1x+yvsx+yx2+y2
(x2+y2)vs(x+y)2
0<2xy
vậy
xyx+y<x2y2x2+y2

c: 9920vs999910
(1001)20vs(10021)10=(1001)10(100+1)10
(1001)10vs(100+1)10
hay (1001)10<(100+1)10
vậy 
9920<999910

d: 231vs321
231=23.228=8(16)7
321=277
231vs321
8(16)7vs277
8vs(27/16)7
(27/16)7>1.57>8
vậy  231<321

nhớ vote
Câu 2 tính sau
ths,,, giup m 2 caau conf laij nha –  parkjiyeonkpf 18-06-14 02:06 PM

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