A + 1 + 2-7a divided by a + 2) divided by (the square of A-4 divided by the square of a + 4A + 4)

A + 1 + 2-7a divided by a + 2) divided by (the square of A-4 divided by the square of a + 4A + 4)

=(a + 1) + (2-7a) / (a + 2) divided by (a ^ 2-4) / (a ^ 2 + 4A + 4)
=[(a + 1) (a + 2) + (2-7a)] / (a + 2) divided by [(a + 2) (A-2)] / (a + 2) ^ 2
=(a ^ 2-4a + 4) / (a + 2) divided by (A-2) / (a + 2)
=(A-2) ^ 2 / (a + 2) times (a + 2) / (A-2)
=a-2

1000 & # 178 / 252 & # 178; - 248 & # 178; simple calculation by factorization

1000²/(252²-248² )
=1000²/[(252+248)(252-248)]
=1000²/(500*4)
=1000²/2*1000
=1000/2
=500

Factorization 252 & # 178; - 248 & # 178; 1000 parts & # 178;

252-248-178; 1000 / 178;
=1000^2/(252+248)(252-248)
=1000^2/500*4
=500

Factorization for 0.25 to the power of 2006 * 4 to the power of 2007 - 8 to the power of 1000 * 0.5 to the power of 1001

=4 * (power of 1-2)

-Square of [- (negative half)] + square of (negative half)

-Square of [- (negative half)] + (negative half) = - 1 / 4 + 1 / 4 = 0

If the square of a is the square of (minus half), then a =?

Plus or minus half

2 (a + b) (a-b) - (a + b) square + (a-b) square, where a = 2, B = half

If the square of (a-half) + |a + B + 3| = 0
If the square of (a-half) + |a + B + 3| = 0
Find the value of: (- A's square + 3ab-half B's Square) - (- 2A's square + 4ab-half B's Square)
Better to give more points

∵(a-1/2)^2 + |a+b+3|=0
∴a-1/2=0,a+b+3=0
The solution is a = 1 / 2, B = - 3-A = - 7 / 2
∴（-a^2+3ab-(b/2)^2/）-(-2a^2+4ab-(b/2)^2)
=a^2-ab
=a(a-b)
=1/2*4
=2

The second power of 103 + the second power of 97

103 + 97 = (100 + 3) square + (100-3) square = 20018

The square of (99 half) is the square of (100 half)·········

The square of (991 / 2) - (1001 / 2)
=(99.5+100.5)x(99.-100.5)
=200x-1
=-200