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I learned the math workbook seven times.
1, calculate (m+2)? -m?

=m? +4m+4-m? =4m+4

2. Calculation (m-5)? -(m-2)(m+3)= 1

m? - 10m+25-(m? +m-6)

=m? - 10m+25-m? -m+6

=- 1 1m+3 1

3. Calculate 103?

=( 100+3)?

=( 100? )+( 2× 100×3 )+( 3? )

=( 100609 )

4. Calculate (a+b+ 1)(a+b- 1)

=( a+b)? -( 1)?

=(a? +2ab+b? - 1 )

5. Calculation (a-2b)? -(a+2b)?

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

=2a×(-4b)

=-8ab

6. Calculate (m+n-2)?

=(m+n)? -4(m+n)+4

=m? +2mn+n? -4m-4n+4