Question

Bài 1 đơn giant cacd biểu thức sau

a. (7x-4)×(2x+3)-13x

b. a^3-(a^2-3a) ×(a+3)

c. (2a-b) ×(b+4a) +2a×(b-3a) 

d. 5b×(2x-b) +(x-6a) ×(5a+2x) 

Answer 1

\(\left(7x-4\right)\left(2x+3\right)-13x\)

\(=14x^2+21x-8x-12-13x\)

\(=14x^2-12\)

\(a^3-\left(a^2-3a\right)\left(a+3\right)\)

\(=a^3-\left(a^3+3a^2-3a^2-9a\right)\)

\(=a^3-a^3-3a^2+3a^2+9a\)

\(=9a\)

\(\left(2a-b\right)\left(b+4a\right)+2a\left(b-3a\right)\)

\(=2ab+8a^2-b^2-4ab+2ab-6a^2\)

\(=\)\(2a^2-b^2\)

\(5b\left(2x-b\right)+\left(x-6a\right)\left(5a+2x\right)\)

\(=10bx-5b^2+5ax+2x^2-30a^2-12ax\)

\(=2x^2-30a^2-5b^2+10bx-7ax\)