Thu gọn các tổng sau: a, (a – b + c – d) – ( a + b + c + d ) b, (-a + b – c) + (a – b) -(a – b + c) c,-(a – b – c) + (b + c + d) – (-a + b+ d)

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1. a, (a – b + c – d) – ( a + b + c + d )

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

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

   = 0    -0     +    0     -0

   =0

   b, (-a + b – c) + (a – b) -(a – b + c)

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

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

   = -0   + 0    – 0

   =0

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

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

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

   = -0       + b         +  c.2    +0

   = (-0) +0      +b + c,2

   =    0 + b + c.2

   =b     +c.2

   @skymeo gửi bn ạ . Chúc bn hc tốt!!

    

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2. a, (a – b + c – d) – ( a + b + c + d )

    =a – b + c – d-a – b-c – d

   =-2b-2d

   =2(b-d)

   b, (-a + b – c) + (a – b) -(a – b + c)

   =-a + b – c +a – b -a – b + c

   =-a + b -2c

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

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

   =b

   CHUẨN 100000..% NHÉ

   CHÚC HK TỐT

    

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