Question

rút gọn biểu thức

A=(5a-5)^2+10(a-3)(1+a)(3a)

Answer 1

\(A=\left(5a-5\right)^2+10\left(a-3\right)\left(1+a\right).3a\)

\(A=25a^2-50a+25+30a\left(a-3+a^2-3a\right)\)

\(A=25a^2-50a+25+30a^2-90a+30a^3-90a^2\)

\(A=30a^3-35a^2-140a+25\)

Answer 2

Ta có: \(A=\left(5a-5\right)^2+10\left(a-3\right)\left(a+1\right)\cdot3a\)

\(=25a^2-50a+25+30a\left(a^2-2a-3\right)\)

\(=25a^2-50a+25+30a^3-60a^2-90a\)

\(=30a^3-35a^2-140a+25\)