Question

Ex3 ,4 va roggggggggg

Answer 1

3 . a) 409 421 + 299 756 = 709 177
b) 409 421 - 299 756 = 109 665
c) 709 117 - 109 655 = 599 512




4 . a) 700 - [ 400 - ( 300 - x ) ] = 500
( A )
[ 400 - ( 300 - x ) ] = 700 - 500
[ 400 - ( 300 - x ) ] 200
( B )
( 300 - x ) = 400 - 200
( 300 - x ) = 200
x = 300 - 200
x = 100





b) 600 - [ 300 - ( 25 + x ) ] = 425
( A )
[ 300 - ( 25 + x ) ] = 600 - 425
[ 300 - ( 25 + x ) ] = 175
( B )
( 25 + x ) = 300 - 175
( 25 + x ) = 125
x = 125 - 25
x = 100