Question

tính (3a+2b-1)(a+5)-2b(a-2)

 

Answer 1

\(\left(3a+2b-1\right)\left(a+5\right)-2b\left(a-2\right).\)

\(=3a^2-15a+2ab+10b-a-5-2ab+4b\)

\(=3a^2-16a+14b\)

Answer 2

\(\left(3a+2b-1\right)\left(a+5\right)-2b\left(a-2\right)\)

\(=3a^2-15a+2ab+10b-a-5-2ab+4b\)

\(=3a^2-16a+14b\)