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vidangtinhyeu2552006
2 năm trước
Bài 8:Tính hợp lý nhất: b) –23 . 63 + 23 . 21 –58 . 23 a/ 210 + [46 + (–210) + (–26)] b) (–8)–[(–5) + 8]; c) 25.134 + 25.(–34) Bài 9:Tìm sốnguyên x biết: a)3x –27 = 9 b)2x + 12 = 3.(x –7) c)2x2–1 = 49 d)x + (–35)= 18 e)2x –(–17) = 25 f)3x –65 = –7 –13
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