Bai 1 : Tim so nguyen x, biet :
a, 3 - ( 17 - x ) = 289 - ( 36 + 289 )
b, 25 - ( x + 5 ) = - 415 - ( 15 - 415 )
c, 34 + ( 21 - x ) = ( 3747 - 30 ) - 3746
Bai 2 : Tim x thuoc Z, biet :
a, ( + 22 ) + ( + 23 ) + x = 21 + | -24 |
b, | -3 | + | -7 | = x + 3
Bai 3 : Tinh nhanh
a, 4524 - ( 864 - 999 ) - ( 36 + 3999 )
b, 1000 - ( 137 + 572 ) + ( 263 - 291 )
c, -329 + ( 15 - 101 ) - ( 25 - 440 )
MINH CAN GAP !!!!!!!
