Tính bằng cách thuận tiện

8262×10001-8262

12567×999+12567

91276×1425-91276×425

1256×825+175×1256

8195×65+8195×34+8195

5600+7200+2800+4400

$Đáp$ $án$ $+$ $Giải$ $thích$ $các$ $bước$ $giải$ $:$

   $8262$ $\times$ $10001$ $-$ $8262$

$=$ $8262$ $\times$ $( 10001 - 1 )$

$=$ $8262$ $\times$ $10000$

$=$ $82 620 000$

_______________________________________

   $12567$ $\times$ $999$ $+$ $12567$

$=$ $12567$ $\times$ $( 999 + 1 )$

$=$ $12567$ $\times$ $1000$

$=$ $12567000$

_______________________________________

   $91276$ $\times$ $1425$ $-$ $91276$ $\times$ $425$

$=$ $91276$ $\times$ $( 1425 - 425 )$

$=$ $91276$ $\times$ $1000$

$=$ $91276000$

_______________________________________

   $1256$ $\times$ $825$ $+$ $175$ $\times$ $1256$

$=$ $1256$ $\times$ $( 825 + 175 )$

$=$ $1256$ $\times$ $1000$

$=$ $1256000$

_______________________________________

   $8195$ $\times$ $65$ $+$ $8195$ $\times$ $34$ $+$ $8195$

$=$ $8195$ $\times$ $( 65 + 34 + 1 )$

$=$ $8195$ $\times$ $100$

$=$ $819500$

______________________________________

   $5600$ $+$ $7200$ $+$ $2800$ $+$ $4400$

$=$ $( 5600 + 4400 )$ $+$ $( 7200 + 2800 )$

$=$ $10000$ $+$ $10000$

$=$ $20000$

@namlebao

    Chúc cậu học giỏi nha, PLS câu trả lời hay nhất.