Question

(532.7-266.14).(532.7+266)tinhnhanh

Answer 1

( 532×7 − 266 × 14 ) × ( 532 × 7 + 266 )

= ( 266 × 2 × 7 − 266 × 14 ) × ( 532 × 7 + 266 )

= ( 266 × 14 − 266 × 14 ) × ( 532 × 7 + 266 )

= 0 × 7 x ( 532 × 7 + 266 )

= 0