Question

Rút gọn biểu thức : - ( a - 2 ) - ( - a + 5 )

Answer 1

−(a−2)−(−a+5)−(a−2)−(−a+5)

=−a+2+a−5=−a+2+a−5

=(−a+a)+(2−5)=(−a+a)+(2−5)

=−3

Answer 2

-(a-2)-(-a+5)=-a+2+a-5=-3