Question

Za a - b 2a + b 5 2 m+n 3 4 3m - 3n + - m + n 3m - n 2m² - 4mn + 2n²​

Answer 1

6)(2a×10)-2(a-b)-5(2a+b)

20a-2a-2b-10a-5b

8a-7b/10

7)(m+n)-3(m+n)

m+n-3m-3n

-2m-2n/3

8)4×2(m-n)+(3m-n)×3

8m-8n+9m-3n

17m-11n/6(m-n)²