Simple operation of 38 + 175 + 62

Simple operation of 38 + 175 + 62

38+175+62
=(38+62)+175
=100+175
=275

2002^2-4X2002+2^2
1997^2+6X1997+3^2
X is the multiply sign!

2002^2-4*2002+2^2
=2002^2-2*2*2002+2^2
=(2002-2)^2
=2000^2
=4000000
1997^2+6*1997+3^2
=1997^2+2*3*1997+3^2
=(1997+3)^2
=2000^2
=4000000

As shown in the figure, it is known that the quadrilateral ABCD is a parallelogram. On the extension line of AB, intercept be = AB, BF = BD, connect CE and DF, and intersect at point M. verification: CD = cm

It is proved that: ∵ quadrilateral ABCD is a parallelogram, ∵ AB is parallel and equal to DC. And ∵ be = AB, ∵ be is parallel and equal to DC. The ∵ quadrilateral bdce is a parallelogram. ∵ DC ∵ BF, ∵ CDF = ∵ F. similarly, ∵ BDM = ∵ DMC. ∵ BD = BF, ∵ BDF = ∵ f.