四年级下册数学书人教版47页第六大题怎么做

题目

四年级下册数学书人教版47页第六大题怎么做

答案

98+265+202
=98+202+265
=565
273-73-27
=273-(73+27)
=173
250*13*4
=250*4*13
=13000
3200/4/25
=3200/(4*25)
=32
88*125
=(80+8)*125
=11000
99*38+38
=(99+1)*38
=3800
17*23-23*7
=(17-7)*23
=230
72*125
=(80-8)*125
=9000