48 x 125 + 875 x 49
48 x 49 x ( 125 + 875 )
48 x 49 x 1000
2352 x 1000
2352000
K nha
48 x 125 + 875 x 49
= 48 x 125 + 125 x 7 x 49
= 48 x 125 + 125 x 343
= (48 + 343) x 125
= 391 x 125
= 48875
48 x 125 + 875 x 49
= 48 x 125 + 875 x (48 + 1)
= 48 x 125 + 875 x 48 + 875 x 1
= 48 x (125 + 875) + 875 x 1
= 48 x 1000 + 875
= 48000 + 875
= 48875