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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Chứng minh rằng -(a+b+c)+(b+c-1)=(b-c+6)-(7+a+b)+c

Toán Lớp 6: Chứng minh rằng
-(a+b+c)+(b+c-1)=(b-c+6)-(7+a+b)+c

Comments ( 2 )

  1. $-\left(a+b+c\right)+\left(b+c-1\right)=\left(b-c+6\right)-\left(7+a+b\right)+c$
    $-\left(a+b+c\right)+b+c-1=b-c+6-\left(7+a+b\right)+c$
    $-\left(a+b+c\right)+b+c-1=-c+c+b-\left(a+b+7\right)+6$
    $-\left(a+b+c\right)+b+c-1=b-\left(a+b+7\right)+6$
    $-a-1=-a-1$
    $-a-1+1=-a-1+1$
    $-a=-a$
    $-a+a=-a+a$
    $⇒0=0$
     

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222-9+11+12:2*14+14 = ? ( )