Complete the following words with suitable words or figures.
___________ can be written as 5×a×b×c.
⇒ 5×a×b×c=5abc
Complete the following statements with suitable words or figures.
18+6+18+7=18×(6+......)
4763-...........=4763
99,999=99,999+...........
800+(,,,,,,,+391)=(........+648)+391
72+597+28+403=,,,,,,,,,,,,