Question

[Yang Yang]

Thực hiện phép tính :
a)5x² - 3x . (x-2)
b) 3x.(x-5)-5x.(x+7)
c) 5x.(1/5x-2)=3.(6-1/3x²)
d) 7x.(x-5)+3.(x-2)
e) 5-4x.(x-2)+4x²
f)4x.(2x-3)-5x.(x-2)

Answer 1

[lê thị hương giang]

\(a,5x^2-3x\left(x-2\right)\)

\(=5x^2-3x^2+6x\)

\(=2x^2+6x\)
\(b,3x\left(x-5\right)-5x\left(x+7\right)\)
\(=3x^2-15x-5x^2-35x\)

\(=-2x^2-50x\)

c, Đề ko rõ Yang Yang

\(d,7x\left(x-5\right)+3\left(x-2\right)\)

\(=7x^2-35x+3x-6\)

\(=7x^2-32x-6\)

\(e,5-4x\left(x-2\right)+4x^2\)

\(=5-4x^2+8x+4x^2\)

\(=5+8x\)

\(f,4x\left(2x-3\right)-5x\left(x-2\right)\)

\(=8x^2-12x-5x^2+10x\)

\(=3x^2-2x\)