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nguyendailong289
2 năm trước
Bài 4:Tìmx ,biết: a. (x – 30) – 40 = 0 b. 200+ (118 – x) = 307 c. 176 – (x + 21) = 80 Bài 5:Tính: a) 1- 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9. b) 1 - 3 + 5 - 7 + 9 - 11 + … + 91 - 93 + 95 - 97 + 99. Bài 6 :Lớp 6A có 33họcsinh, lớp 6B có 32 họcsinh, lớp 6C có 27 họcsinh . Hỏicảbalớp 6A; 6B; 6C cóbaonhiêuhọcsinh ? Bài 7:Mộttrường THCS cósốhọcsinhcủakhốilớp 6 là 102 HS, khốilớp 7 cónhiềuhơnkhốilớp 6 là13 HS, khốilớp 8 cóíthơnkhốilớp7 là 9 HS, khốilớp 9 cóíthơnkhối 8 là 5 HS. Tínhsốhọcsinhtoàntrườngcủatrường THCS đó? Giúp mik nha
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