Toán Lớp 6: a) (-139).71-(-2022-71.139)
b) 7/19.8/11+7/19.3/11-(-12/19)
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Toán Lớp 6: a) (-139).71-(-2022-71.139)
b) 7/19.8/11+7/19.3/11-(-12/19)
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