Overview: 6 questions will be solved this time.Among them
           ☆6 arithmetic calculations

[1/6 Formula]
    Work: Calculate the value of equation 9+99+999+9999+99999 .
    Question type: Mathematical calculation
    Solution:
          9+99+999+9999+99999
        =108+999+9999+99999
        =1107+9999+99999
        =11106+99999
        =111105
    Answer:9+99+999+9999+99999=111105
[2/6 Formula]
    Work: Calculate the value of equation 23*7+46*15+(23-20)*23 .
    Question type: Mathematical calculation
    Solution:
          23*7+46*15+(23-20)*23
        =23*7+46*15+3*23
        =161+46*15+3*23
        =161+690+3*23
        =161+690+69
        =851+69
        =920
    Answer:23*7+46*15+(23-20)*23=920
[3/6 Formula]
    Work: Calculate the value of equation 1-2+3-4+5-6+7-8+9-10+11-12+13-14+15 .
    Question type: Mathematical calculation
    Solution:
          1-2+3-4+5-6+7-8+9-10+11-12+13-14+15
        =-1+3-4+5-6+7-8+9-10+11-12+13-14+15
        =2-4+5-6+7-8+9-10+11-12+13-14+15
        =-2+5-6+7-8+9-10+11-12+13-14+15
        =3-6+7-8+9-10+11-12+13-14+15
        =-3+7-8+9-10+11-12+13-14+15
        =4-8+9-10+11-12+13-14+15
        =-4+9-10+11-12+13-14+15
        =5-10+11-12+13-14+15
        =-5+11-12+13-14+15
        =6-12+13-14+15
        =-6+13-14+15
        =7-14+15
        =-7+15
        =8
    Answer:1-2+3-4+5-6+7-8+9-10+11-12+13-14+15=8
[4/6 Formula]
    Work: Calculate the value of equation 8*88+88*66 .
    Question type: Mathematical calculation
    Solution:
          8*88+88*66
        =704+88*66
        =704+5808
        =6512
    Answer:8*88+88*66=6512
[5/6 Formula]
    Work: Calculate the value of equation 1*2*3*4*5*6*7*8-1*2*3*4*5*6*7+1*2-1 .
    Question type: Mathematical calculation
    Solution:
          1*2*3*4*5*6*7*8-1*2*3*4*5*6*7+1*2-1
        =2*3*4*5*6*7*8-1*2*3*4*5*6*7+1*2-1
        =6*4*5*6*7*8-1*2*3*4*5*6*7+1*2-1
        =24*5*6*7*8-1*2*3*4*5*6*7+1*2-1
        =120*6*7*8-1*2*3*4*5*6*7+1*2-1
        =720*7*8-1*2*3*4*5*6*7+1*2-1
        =5040*8-1*2*3*4*5*6*7+1*2-1
        =40320-1*2*3*4*5*6*7+1*2-1
        =40320-2*3*4*5*6*7+1*2-1
        =40320-6*4*5*6*7+1*2-1
        =40320-24*5*6*7+1*2-1
        =40320-120*6*7+1*2-1
        =40320-720*7+1*2-1
        =40320-5040+1*2-1
        =40320-5040+2-1
        =35280+2-1
        =35282-1
        =35281
    Answer:1*2*3*4*5*6*7*8-1*2*3*4*5*6*7+1*2-1=35281
[6/6 Formula]
    Work: Calculate the value of equation 2+44+666+8888+66666+444444+2222222 .
    Question type: Mathematical calculation
    Solution:
          2+44+666+8888+66666+444444+2222222
        =46+666+8888+66666+444444+2222222
        =712+8888+66666+444444+2222222
        =9600+66666+444444+2222222
        =76266+444444+2222222
        =520710+2222222
        =2742932
    Answer:2+44+666+8888+66666+444444+2222222=2742932

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