Thực hiện tính: a) (–2).(–7).(–5) + (–5)
Giải thích
a) (–2).(–7).(–5) + (–5).(–6)
= –(2.7.5) + 5.6
= –70 + 30
= –40
b) (–7).2.(–5) – 8.(–3)2
= 7.2.5 – 8.9
= 70 – 72
= –2
c) 700 – (–200) – 300 – 100
= 700 + 200 – 300 − 100
= 900 – 300 − 100
= 600 − 100
= 500
d) 175 – (–25) – (–3)2 + (–38 + 40).(–2)
= 200 – 9 − 4
= 191 − 4
= 187