Question

124*45+56*24-124 利用简便算法计算,

Answer 1

124*45+56*24-124

=124*45-124+56*24

=124*(45-1)+56*24

=124*44+56*24

=124*4*11+(40+16)(40-16)

=496*11+40^2-16^2

=5456+1600-256

=5200+1600

=6800