Question

ko tinh gia tri cu the 

so sanh a va b

1/ a = 1998^2 b=1996.2000

2/a = 2000^2 b=1990.2010

3/ a=37.13-13 b=24+37.12

giai thich cu the va theo cach lop 6 

camon

Answer 1

1) \(a=1998^2=1998.1998=1998.\left(1996+2\right)=1998.1996+1998.2\)

\(b=1996.2000=1996.\left(1998+2\right)=1996.1998+1996.2\)

Vì 1998.1996 + 1998.2 > 1996.1998 + 1996.2

=> a > b

Answer 2

\(a=1998^2=1998.1998\)

Ta có :

a = 1998 . 1998

a = 1998 . ( 1996 + 2 )

a = 1998 . 1996 + 1998 . 2

b = 1996 . 2000

b = 1996 . ( 1998 + 2 )

b = 1996 . 1998 + 1996 . 2

Vì 1996 . 2 < 1998 . 2

=> 1998 . 1998 > 1996 . 2000

Answer 3

con cac cau kia thi sao a