Question

Thu gọn A = -(x+y-z)+(x-2y+3z)-(x-3y+4z)

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Answer 1

\(A=-\left(x+y-z\right)+\left(x-2y+3z\right)-\left(x-3y+4z\right)\)

\(A=-x-y+z+x-2y+3z-x+3y-4z\)

\(A=\left(-x+x-x\right)+\left(-y-2y+3y\right)+\left(z+3z-4z\right)\)

\(A=-x+0+0=-x\)