First simplify, then evaluate: B ^ 4 + (- a-b) (- A + b) (a ^ 2 + B ^ 2), where: a = - 1, B = 2011

First simplify, then evaluate: B ^ 4 + (- a-b) (- A + b) (a ^ 2 + B ^ 2), where: a = - 1, B = 2011

First simplify, then evaluate (a + b) (a-b) + B (b-2), where a = - 2, B = -- 1

First simplify, then evaluate: A ^ 2 + 2a-3 / (a ^ 2 + 5A + 6) × a ^ 2-4 / (a ^ 2-2a + 1) △ 1 / A ^ 2-1, where a satisfies a ^ 2-a-2010 = 0

a²-a=2010
The original formula = (a + 3) (A-1) / (a + 2) (a + 3) × (a + 2) (A-2) / (A-1) & # 178; × (a + 1) (A-1)
=(a+1)(a-2)
=a²-a-2
=2010-2
=2008

Simple operation of multiplying 2008 by 2012

Using the square difference formula:
2008×2012=(2010-2)(2010+2)=2010²-4=4040100-4=4040096

Simple calculation: 2010-2012 × 2008

2010²-2012×2008
=2010²-(2010+2)×(2010-2)
=2010²-(2010²-2²)
=2010²-2010²+2²
=4

Calculation by simple method: 2012 ^ 2-2012 * 2010-2010 * 2008 + 2008 ^ 2

2012^2-2012*2010-2010*2008+2008^2
=(2012^2-2012*2010)-(2010*2008-2008^2)
=2012（2012-2010）-2008（2010-2008）
=2012×2-2008×2
=2×(2012-2008)
=8

What is the result of 4 + 8 + 12 + 16 +... + 2004 + 2008 + 2012

4+8+12+16+...+2004+2008+2012
=(4+2012)*503/2
=1008*503
=507024

420 square decimeters, 42 square meters, 4200 square centimeters

42 square meters > 420 square decimeters > 4200 square centimeters

Comparative size: 3 square meters () 30 square centimeters 150 minutes () 1.5 hours 300 seconds (9000 square centimeters () 900 square minutes)
2kg 200g () 2200g 40ha () 4km2 43l () 4200 cm3 4.06km () 3km 6M

3 square meters (>) 30 square centimeters 150 minutes（

1 square centimeter = () square decimeter = () square meter
1 sq m = () sq km

1 square centimeter = 0.01 square decimeter = 0.0001 square meter
1 square meter = 0.000001 square kilometers