Tính 40 + (139 – 172 + 99) – (139 + 199 – 127) = ?
Giải thích
40 + (139 – 172 + 99) – (139 + 199 – 127)
= (139 − 139) + ( 99 – 199) + (127 – 172 + 40)
= 0 – 100 + (–45 + 40)
= – 100 – 5
= – 105.
40 + (139 – 172 + 99) – (139 + 199 – 127)
= (139 − 139) + ( 99 – 199) + (127 – 172 + 40)
= 0 – 100 + (–45 + 40)
= – 100 – 5
= – 105.