Question

X×{1999+2000+2001}=99×7-99×4-99-99×2

Answer 1

\(x\cdot\left(1990+2000+2001\right)=99\cdot7-99\cdot4-99-99\cdot2\)

\(\Leftrightarrow x\cdot\left(1999+2000+2001\right)=99\cdot\left(7-4-1-2\right)\)

\(\Leftrightarrow x\cdot\left(1999+2000+2001\right)=99\cdot0\)

\(\Leftrightarrow x\cdot\left(1999+2000+2001\right)=0\)

\(\Rightarrow x=0\)

Answer 2

\(x\times\left(1999+2000+2001\right)=99\times7-99\times4-99-99\times2\)

\(x\times\left(1999+2000+2001\right)=99\times\left(7-4-1-2\right)\)

\(x\times\left(1999+2000+2001\right)=99\times0\)

\(x\times\left(1999+2000+2001\right)=0\)

\(\Rightarrow x=0\)

Vậy \(x=0\)

Answer 3

\(6000x=99\left(7-4-1-2\right)\)

\(6000x=0\)

\(x=0\)