887*125-87*125
=125*(887-87)
=125*800
=100000
25*48
=25*4*12
=100*12
=1200
2800*25*4
=2800*100
=280000
四年级数学课时特训答题目887*125-87*125 25*48 2800*25*4怎样简便
887*125-87*125
=125*(887-87)
=125*800
=100000
25*48
=25*4*12
=100*12
=1200
2800*25*4
=2800*100
=280000