a: \(25\cdot37+63\cdot25\)
\(=25\left(37+63\right)\)
\(=25\cdot100=2500\)
b: \(\left(-210\right)+325+\left(-90\right)+175\)
\(=\left(-210-90\right)+\left(325+175\right)\)
=-300+500
=200
a) 25.37 + 63.25
=25x(37+63)
=25x100
=2500
b) (-210) + 325 + (-90) + 175
=(-210-90)+(325+175)
=-300+500
=200