Question

Thực hiện phép tính:
a) (5x-4y³).(2x²-1+y)
b) (x-3).(2x-1)-(2x-7).x

Answer 1

a) \(\left(5x-4y^3\right)\left(2x^2-1+y\right)=10x^3-5x+5xy-8x^2y^3+4y^3-4y^4=-4y^4+10x^3+4y^3-8x^2y^3+5xy-5x\)

b) \(\left(x-3\right)\left(2x-1\right)-\left(2x-7\right)x=2x^2-7x+3-2x^2+7x=3\)

Answer 2

\(a,=10^3-5x+5xy-8y^3x^2+4y^3-4y^4\\ b,=3\)

tick mik nha

Answer 3

a: \(\left(5x-4y^3\right)\left(2x^2+y-1\right)\)

\(=10x^2+5xy-5x-8x^2y^3-4y^4+4y^3\)

b: \(\left(x-3\right)\left(2x-1\right)-x\left(2x-7\right)\)

\(=2x^2-x-6x+3-2x^2+7x\)

=3