Question

Giúp mình câu này với!làm ơn!

Answer 1

\(C=\left(x-2\right)\left(x+2\right)-\left(x-3\right)\left(x+1\right)\)

\(=x^2-4-x^2-x+3x+3\)

\(=2x-1\)

Vậy...

Answer 2

\(C=\left(x-2\right).\left(x+2\right)-\left(x-3\right).\left(x+1\right)\)

\(C=x^2+2x-2x-4-x^2-x+3x+3\)

\(C=\left(x^2-x^2\right)+\left(2x-2x-x+3x\right)+\left(-4+3\right)\)

\(C=2x-1\)

Chúc bạn học tốt!!!

Answer 3

\(C=\left(x-2\right)\left(x+2\right)-\left(x-3\right)\left(x+1\right)\)

\(\Leftrightarrow C=x^2+2x-2x-4-x^2-x+3x+3\)

\(\Leftrightarrow C=2x-1\)

Answer 4

nà

Answer 5

\(C=\left(x-2\right)\left(x+2\right)-\left(x-3\right)\left(x+1\right)\)

\(=x^2-4-x^2-x+3x+1=2x-3\)

Answer 6

C=(x-2)(x+2)-(x-3)(x+1)

=x²-4-x²-x+3x+1=2x-3