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2022-05-11 20:47:47
1 ô tô chuyển được số thóc là :
45 : 5 = ... ( tạ )
đổi : ( 45 : 5 ) tạ = ... tấn
2022-05-11 20:41:43
quy đồng mẫu số rồi cộng vào thôi!
2022-05-11 20:40:28
2022-05-11 20:39:49
các số có mẫu giống nhau thì cộng vào thôi !
2022-05-11 20:37:51
2022-05-11 20:37:31
không khí: khói bụi, khí độc hại,...
nước:nước thải, hóa chất, ...
2022-05-09 21:43:20
2022-05-09 21:41:00
2022-05-09 21:40:37
2022-05-09 21:39:46