49×(99十49)怎样用简便计算

2024-11-22 20:23:41
推荐回答(2个)
回答(1):

49×(99十49)
=49×100+49×48
=4900+(50-1)×48
=4900+50×48-48
=4900+100×24-48
=4900+2400-48
=7300-48
=7252

回答(2):

49×(99十49)
=49*100+49*48