Q.1000 – 70+30 – 10 =50²25²Note :V​

1000 – 70 + 30 – 10

= 1000 – ( 70 + 30 ) – 10

= 1000 – 100 – 10

= 900 – 10

= 890

50²

= 50 × 50

= ( 5 × 5 ) 00

= 2.500

25²

= ( 25 × 25 )

= 625