Question

Thu gọn tổng sau

-(a-b-c)+(b-c+d)-(a+d)

Answer 1

= -a+b+c+b-c+d-a-d

=(-a-a)+(b+b)+(c-c)+(d-d)

=-2a+2b

Answer 2

- ( a-b-c ) + (b-c+d) - (a+d)

= -a + b +c +b - c +d -a -d

= -a + ( -a ) + b + b

= -a .2 + b.2

Answer 3

-( a - b - c ) + ( b - c + d ) - ( a + d )

= - a + b + c + d - c + d - a- d

= ( - a - a ) + ( b + b ) + ( c - c ) + ( d - d )

= -2a + 2b 

Tích mik nha!