Question

因式分解 4×175²-100×25 x²(x-y)+(y²-x²)

Answer 1

x²(x-y)+(y²-x²)

=x²(x-y)-(x+y)(x-y)

=(x-y)(x²-x-y)

4×175²-100×25

=4×(175²-25²)

=4×(175+25)(175-25)

=4×200×150

=120000