ôi ôi bạn ơi
\(\frac{5}{7}\)x18x\(\frac{1}{3}\)-\(\frac{5}{7}\)x 30 x\(\frac{1}{3}\)
=\(\frac{90}{7}\)x\(\frac{1}{3}\)-\(\frac{5}{7}\)x 30 x\(\frac{1}{3}\)
=\(\frac{30}{7}\)-\(\frac{5}{7}\)x 30 x\(\frac{1}{3}\)
=\(\frac{30}{7}\)-\(\frac{150}{7}\)x\(\frac{1}{3}\)
=\(\frac{30}{7}\)-\(\frac{50}{7}\)
=\(\frac{-20}{7}\)
Hok tốt!
@Kaito Kid