tính nhanh 192 ×( 182 – 147) + 182 × ( 47-192)

0 bình luận về “tính nhanh 192 ×( 182 – 147) + 182 × ( 47-192)”

1. `192 ×( 182 – 147) + 182 × ( 47-192)`

   `= 192 ×182 – 192 ×147 + 182 ×  47 – 182 × 192`

   `= (192 ×182 – 182 × 192) – 192 ×147 + 182 ×  47`

   `= – 192 ×147 + 182 ×  47`

   `= – 192 × (100 + 47) + 182 ×  47`

   `= – 192 × 100 + (- 192) × 47 + 182 ×  47`

   `= -19200 + 47(- 192+182)`

   `= -19200 + 47 . (-10)`

   `= -19200 + (-470)`

   `= -19670`

   (Ăn tết zui zẻ ạ)

    

   Bình luận