Question

bài 2: Tính nhanh 

a) A = 201^2

b) B= 498^2

c) C= 93. 107

d) D= 2016^2 - 2015. 2017

e) E=      2016^3 - 1

               ________

          2016^2 + 2017

g) G= 2016^2 - 2015^2 + 2014^2 - 2013^2 + 2012^2 - 2011^2 + 2010^2 - 1^2

Answer 1

\(201^2=\left(200+1\right)^2=200^2+2.200.1+1^2=40000+400+1=40401\)

\(498^2=\left(500-2\right)^2=500^2-2.500.2+2^2=250000-2000+4=248004\)

 

 

 

Answer 2

\(93.107=\left(100-7\right)\left(100+7\right)=100^2-7^2=10000-49=9951\)

\(2016^2-2015.2017=2016^2-\left(2016-1\right)\left(2016+1\right)=2016^2-2016^2+1^2=1\)