1. was
2. went
3. traveled
4. didn't buy
\(6x^4-9x^3\)
\(=3x^2\left(2x-3\right)\)
Does - enjoys
3. Do .....have
5. are
\(31-26+209\left(-35\right)\)
\(=-7310\)
ý là sai chính tả á .-.