Toán Lớp 6: Đơn giản biểu thức sau: a/ (a–b) – (b+c) + (c–a) – (a–b–c) b/ – (a–b–c) + (–a+b–c) – (–a+b+c)

Question

Toán Lớp 6:  Đơn giản biểu thức sau: a/ (a–b) – (b+c) + (c–a) – (a–b–c)                            b/ – (a–b–c) + (–a+b–c) – (–a+b+c)

tonhitruc · Answer

Giải đáp + Lời giải và giải thích chi tiết:    C&acirc;u hỏi     a/ (a&ndash;b) &ndash; (b+c) + (c&ndash;a) &ndash; (a&ndash;b&ndash;c)     b/ &ndash; (a&ndash;b&ndash;c) + (&ndash;a+b&ndash;c) &ndash; (&ndash;a+b+  c)     C&acirc;u trả lời               &Yacute; a)    (    a    &minus;    b    )     &minus;     (    b    +    c    )     +     (    c    &minus;    a    )     &minus;     (    a    &minus;    b    &minus;    c    )                      =    a    &minus;    b    &minus;    b    &minus;    c    +    c    &minus;    a    &minus;    a    +    b    +    c                     =     (    a    &minus;    a    &minus;    a    )     &minus;     (    b    +    b    &minus;    b    )     &minus;     (    c    &minus;    c    &minus;    c    )                      =    &minus;    2    a    &minus;    b    +    2    c                     &Yacute; b)                        &minus;     (    a    &minus;    b    &minus;    c    )     +     (    &minus;    a    +    b    &minus;    c    )     &minus;     (    &minus;    a    +    b    +    c    )                      =    &minus;    a    +    b    +    c    &minus;    a    +    b    &minus;    c    +    a    &minus;    b    &minus;    c                     =    &minus;     (    a    +    a    &minus;    a    )     +     (    b    +    b    &minus;    b    )     +     (    c    &minus;    c    &minus;    c    )                      =    &minus;    a    +    b    &minus;    2    c

bichhhathu · Answer

a,       (a-b)-(b+c)+(c-a)-(a-b-c)       =a-b-b-c+c-a-a+b+c       =(a-a-a)-(b+b-b)-(c-c-c)       =-2a-b+2c       b,       -(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-2c