bài 6:
q,\(\frac{2}{3}-4.\left(\frac{1}{2}+\frac{3}{4}\right)\) b,\(\left(\frac{-1}{3}+\frac{5}{9}\right).11-7\)
c,\(\left(\frac{-5}{9}\right).\frac{3}{11}+\left(\frac{-13}{18}\right).\frac{3}{11}\) d,\(\left(\frac{-2}{3}\right).\frac{3}{11}+\left(\frac{-16}{9}\right).\frac{3}{11}\)
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