Question

D=150-(100-99+98-97+...-3+2-1)

Answer 1

150-(100-99+98-97+...-3+2-1)

= 150 - ((100-99)+(98-97)+...+(4-3)+(2-1))

=150 - (1.50)

= 100

P/s: k chắc!

Answer 2

\(D=150-\left(100-99+98-87+...+4-3+2-1\right)\)

\(\Rightarrow D=150-\left[\left(100-99\right)+\left(98-97\right)+...+\left(4-3\right)+\left(2-1\right)\right]\)

\(\Rightarrow D=150-\left(1+1+...+1+1\right)\)

\(\Rightarrow D=150-\left(1\cdot50\right)\)

\(\Rightarrow D=150-50\)

\(\Rightarrow D=100\)