m-（2m-n-p）=

m-（2m-n-p）=

m-（2m-n-p）=m-2m+n+p=n+p-m

（m+n)-( )=2m-p
What should be filled in the brackets

(m+n)-( )=2m-p
m+n-(2m-p)=( )
m+n-2m+p=( )
n-m+p=( )

(M + n)? [M - (n + P)] = 2m-p can be filled in - or + what should be filled in? Why?

（m+n）+【m-（n+p）】=2m-p

Let m, N, P satisfy / 2m / + M = 0 / N / = n, p * / P / = 1
Simplification / N / - / m-p-1 / + / P + n / - / 2n + 1 /
Note: absolute value of / X / = x
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M = 0, n > = 0, P = 1
Original formula = n-2 + N + 1-2n-1 = - 2
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