Rút gọn :
`M = x + ( 273 – 120 ) – ( 273 – 120 )`
`B = y + ( – 30 ) – [ 95 + ( – 40 ) + ( -30 )]`
`C = x – ( 294 + 130 ) + ( 94 + 130 )`
Rút gọn :
`M = x + ( 273 – 120 ) – ( 273 – 120 )`
`B = y + ( – 30 ) – [ 95 + ( – 40 ) + ( -30 )]`
`C = x – ( 294 + 130 ) + ( 94 + 130 )`
Câu hỏi mới
M=x+273-120-273+120
=x+0+(-200)