1. 2x + 3x - a =
2. 5x²- 2a + 3a - 2x² =
3. 3x × 15 by 6x² =
4. 15 by b a2² × 9 by 25 b² =
5. 5ab ( 3ab²- 2b ) =
6. ( 5x + 3y ) ( 2x - 5y ) =
7. 3 by 4 ab × 2 by 9 b²
please help me
and please do it fast
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supper question
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i don't known answer for this question.
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