Question

thực hiện phép tính
a, 2x.(3x²+1)
b, (2x³-5x²+6x):2
c, (x-3).(x+5)-x(x+2)

help 30 phút nữa thi rồi

 

Answer 1

\(a,2x\left(3x^2+1\right)=6x^3+2x\)

\(b,\left(2x^3-5x^2+6x\right):2=x^3-\dfrac{5}{2}x^2+3x\)

\(c,\left(x-3\right)\left(x+5\right)-x\left(x+2\right)=x^2+5x-3x-15-x^2-2x=-15\)