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

[1/3 Formula]
    Work: Calculate the value of equation 99*135+99*276+99*89 .
    Question type: Mathematical calculation
    Solution:
          99*135+99*276+99*89
        =13365+99*276+99*89
        =13365+27324+99*89
        =13365+27324+8811
        =40689+8811
        =49500
    Answer:99*135+99*276+99*89=49500
[2/3 Formula]
    Work: Calculate the value of equation 1+2+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1 .
    Question type: Mathematical calculation
    Solution:
          1+2+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1
        =3+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1
        =6+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1
        =10+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1
        =15+6+7+8+9+10+9+8+7+6+5+4+3+2+1
        =21+7+8+9+10+9+8+7+6+5+4+3+2+1
        =28+8+9+10+9+8+7+6+5+4+3+2+1
        =36+9+10+9+8+7+6+5+4+3+2+1
        =45+10+9+8+7+6+5+4+3+2+1
        =55+9+8+7+6+5+4+3+2+1
        =64+8+7+6+5+4+3+2+1
        =72+7+6+5+4+3+2+1
        =79+6+5+4+3+2+1
        =85+5+4+3+2+1
        =90+4+3+2+1
        =94+3+2+1
        =97+2+1
        =99+1
        =100
    Answer:1+2+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1=100
[3/3 Formula]
    Work: Calculate the value of equation 9999*1111+3333*6667 .
    Question type: Mathematical calculation
    Solution:
          9999*1111+3333*6667
        =11108889+3333*6667
        =11108889+22221111
        =33330000
    Answer:9999*1111+3333*6667=33330000

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