Overview: 3 questions will be solved this time.Among them
           ☆3 arithmetic calculations

[1/3 Formula]
    Work: Calculate the value of equation 9*9+99*99+999*999+9999*9999+99999*99999 .
    Question type: Mathematical calculation
    Solution:
          9*9+99*99+999*999+9999*9999+99999*99999
        =81+99*99+999*999+9999*9999+99999*99999
        =81+9801+999*999+9999*9999+99999*99999
        =81+9801+998001+9999*9999+99999*99999
        =81+9801+998001+99980001+99999*99999
        =81+9801+998001+99980001+9999800001
        =9882+998001+99980001+9999800001
        =1007883+99980001+9999800001
        =100987884+9999800001
        =10100787885
    Answer:9*9+99*99+999*999+9999*9999+99999*99999=10100787885
[2/3 Formula]
    Work: Calculate the value of equation 1+2+3+4+5+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1 .
    Question type: Mathematical calculation
    Solution:
          1+2+3+4+5+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =3+3+4+5+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =6+4+5+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =10+5+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =15+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =21+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =28+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =36+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =45+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =55+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =66+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =78+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =91+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =103+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =114+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =124+9+8+7+6+5+4+3+2+1+1+2+3+2+1
        =133+8+7+6+5+4+3+2+1+1+2+3+2+1
        =141+7+6+5+4+3+2+1+1+2+3+2+1
        =148+6+5+4+3+2+1+1+2+3+2+1
        =154+5+4+3+2+1+1+2+3+2+1
        =159+4+3+2+1+1+2+3+2+1
        =163+3+2+1+1+2+3+2+1
        =166+2+1+1+2+3+2+1
        =168+1+1+2+3+2+1
        =169+1+2+3+2+1
        =170+2+3+2+1
        =172+3+2+1
        =175+2+1
        =177+1
        =178
    Answer:1+2+3+4+5+6+7+8+9+10+11+12+13+12+11+10+9+8+7+6+5+4+3+2+1+1+2+3+2+1=178
[3/3 Formula]
    Work: Calculate the value of equation 12345*2345+2469*38275+12345*5000 .
    Question type: Mathematical calculation
    Solution:
          12345*2345+2469*38275+12345*5000
        =28949025+2469*38275+12345*5000
        =28949025+94500975+12345*5000
        =28949025+94500975+61725000
        =123450000+61725000
        =185175000
    Answer:12345*2345+2469*38275+12345*5000=185175000

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