Question

So sánh m và n biết rằng :

M = 2000 x 2014

N = 2007 x 2007

Answer 1

Có M = 2000 . 2014 = 2000.(2007 + 7) = 2000.2007 + 7.2000

N = 2007 . 2007 = (2000 + 7).2007 = 2000.2007 + 7.2007

Có 2000 < 2007

=> 7.2000 < 7.2007

=> 2000.2007 + 7.2000 < 2000.2007 + 7.2007

=> M < N

Answer 2

M = 2000 × 2014

M = 2000 × (2007 + 7)

M = 2000 × 2007 + 2000 × 7

N = 2007 × 2007

N = (2000 + 7) × 2007

N = 2000 × 2007 + 7 × 2007

Vì 2000 x 7 < 7 x 2007

=> M < N

Answer 3

M = 2000 × 2014

M = 2000 × (2007 + 7)

M = 2000 × 2007 + 2000 × 7

N = 2007 × 2007

N = (2000 + 7) × 2007

N = 2000 × 2007 + 7 × 2007

Vì 2000 x 7 < 7 x 2007

=> M < N