38×99+38
=38*(99+1)
=38*100
=3800
1200-399
=1200-400+1
=800+1
=801
260-49-156
=260-(49+156)
=260-205
=55
560÷16÷5
=560÷(16*5)
=560÷80
=7
要采纳先回答的正确答案.是对答题者劳动的尊重.
38×99+38
=38*(99+1)
=38*100
=3800
1200-399
=1200-400+1
=800+1
=801
260-49-156
=260-(49+156)
=260-205
=55
560÷16÷5
=560÷(16*5)
=560÷80
=7
要采纳先回答的正确答案.是对答题者劳动的尊重.