Question

[Huyền Trương Thu]

pha ngoac r don gian bieu thuc:

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

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

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

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

Answer 1

[Trần Thanh Phương]

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

 = a + b + c - b + c - d

 = a + 2c - d

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

 = a + b - c + a - b + d

 = 2a - c + d

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

 = a + b + a - b + c

 = 2a + c

Answer 2

[Trần Thanh Phương]

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

 = -a - b + a + b + c

 = c

Học tốt~