①317×99+317
②3720-4028÷38×6
③48×(-)
④2.5+2.8+2.2+6.5
⑤19÷[(+)÷].
网友回答
解:①317×99+317
=317×(99+1)
=317×100
=31700;
②3720-4028÷38×6
=3720-106×6
=3720-636
=3084;
③48×(-)
=48×-48×
=32-12
=20;
④2.5+2.8+2.2+6.5
=(2.5+6.5)+(2.8+2.2)
=9+5
=14;
⑤19÷[(+)÷]
=19÷[×2]
=19÷
=10;
故