Question

123的平方-101的平方-122*124等于多少、要过程！

Answer 1

原式=123²-(123-1)×(123+1)-(100+1)²
=123²-(123²-1²)-(100²+2×100+1²)
=123²-123²+1-10201
=-10200

Answer 2

123的平方-101的平方-122*124
=123^2-101^2-(123-1)(123+1)
=123^2-101^2-(123^2-1)
=123^2-101^2-123^2+1
=1-101^2
=(1+101)(1-101)
=102x(-100)
=-10200