a) x+ 45 - [90+(-20)+5-(-45)]+3x
= x + 45 - [70+50]+3x
= x + 45 - 120 + 3 x
= ( x + 3x) + (45-120)
= 4x + (-75)
b) x+(294+13)+(94-13)+9x
= ( x + 9x ) + (294+13)+(94-13)
= 10x + 307+81
= 10x + 388
Trả lời:
a) x + 45 - [90 + (-20) + 5 - (-45)] + 3x
= (x + 3x) + 45 - (75 + 45)
= 4x + 45 - 75 - 45
= 4x + (45 - 45) - 75
= 4x + 0 - 75
= 4x - 75
b) x + (294 + 13) + (94 - 13) + 9x
= (9x + x) + 294 + 13 + 94 - 13
= 10x + (294 + 94) + (13 - 13)
= 10x + 388 + 0
= 10x + 388
Banh Bao Tong
deo biet luon ban oi co ban free fire ko