Toán Lớp 6: Bài 1: Thực hiện phép tính (tính nhanh nếu có thể)
a) (– 15) + 45
c) (–4). (–6). (–5)
d) 15 – (–85) + 3mũ4 -100
f) – 71(96 – 30) – 96(30 – 71)
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