Question

78×（301-199）怎么简便运算

Answer 1

78×(301-199)

=78×[(300+1)-(200-1)]

=78×(300-200+2)

=78×(100+2)

=78×100+78×2

=7800+156

=7956

900÷75+900÷25

=300÷25+900÷25

=(300+900)÷25

=1200÷25

=12×100÷25

=12×4

=48