Current location - Training Enrollment Network - Mathematics courses - The ability challenge of learning 2 1 page with you in the next semester of junior one mathematics.
The ability challenge of learning 2 1 page with you in the next semester of junior one mathematics.
1.( 100+99) * ( 100-99)+(99+98) * (99-98)+(97+96) * (97-96)+ ...

2. Let the original rectangular green space be x in length and y in width, and now the square green space is z in length (width), X-2=Z, Y+2=Z, and the square of z =3XY. Can you solve the equation later?