Bỏ dấu ngoặc rồi tính 1) (abc)-(a-bc) 2) (a-bc)(a-b)-(a-b-c) 3) -(a-b-c)-(-abc)-(a-bc) 4) (a-bc-d)-(abcd) 5) (-a

Question

Bỏ dấu ngoặc rồi tính 1) (a+b+c)-(a-b+c) 2) (a-b+c)+(a-b)-(a-b-c) 3) -(a-b-c)-(-a+b+c)-(a-b+c) 4) (a-b+c-d)-(a+b+c+d) 5) (-a+b-c)+(a-b)-(a-b+c) 6) -(a-b-c)+(b-c+d)-(a+b+d)

tuyetnhungthu · Answer

1)(a+b+c)-(a-b+c)   =a+b+c-a+b-c   =(a-a)+(b+b)+(c-c)   =b   _________________________   2) (a-b+c)+(a-b)-(a-b-c)    =a-b+c+a-b-a+b+c     =(a+a-a)-(b+b-b)+(c+c)     =a-b+2c     _____________________________     3) -(a-b-c)-(-a+b+c)-(a-b+c)     =-a+b+c+a-b-c-a+b-c     =(-a+a-a)+(b-b+b)+(c-c-c)     =-a+b-c     ________________________________     4) (a-b+c-d)-(a+b+c+d)     =a-b+c-d-a-b-c-d     =(a-a)-(b+b)+(c-c)-(d+d)     =-2b-2d     __________________________________     5) (-a+b-c)+(a-b)-(a-b+c)     =-a+b-c+a-b-a+b-c     =(-a+a-a)+(b-b+b)-(c+c)     =-a+b-2c     _________________________________     6) -(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)     =-2a+b     ______________________________________     color{skyblue}{nobitaz}

truongankimtrong · Answer

Giải đáp:       Lời giải và giải thích chi tiết:   1) (a+b+c)-(a-b+c)   =a+b+c-a+b-c   =2b   2) (a-b+c)+(a-b)-(a-b-c)   =a-b+c+a-b-a+b+c   =a-b+2c   3) -(a-b-c)-(-a+b+c)-(a-b+c)   =-a+b+c+a-b-c-a+b-c   =-a+b-c   4) (a-b+c-d)-(a+b+c+d)   =a-b+c-d-a-b-c-d   =-2b-2d   5) (-a+b-c)+(a-b)-(a-b+c)   =-a+b-c+a-b-a+b-c   =-a+b-2c   6) -(a-b-c)+(b-c+d)-(a+b+d)   =-a+b+c+b-c+d-a-b-d   = -2a+b   @loanluyendh

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