估算104 x 49至少写出两种估算方法,并估算出结果
估算104 x 49至少写出两种估算方法,并估算出结果
日期:2022-04-01 03:26:00 人气:1
=(100+4)x49
=100x49+4x49
=4900+4x(50-1)
=4900+4x50-4
=4900+200-4
=5096
=104x(50-1)
=104x50-104
=5200-104
=5096
=100x49+4x49
=4900+4x(50-1)
=4900+4x50-4
=4900+200-4
=5096
=104x(50-1)
=104x50-104
=5200-104
=5096