总述：本次共解4题。其中
           ☆算术计算4题

〖1/4算式〗
    作业：求算式 9+99+999+9999+99999 的值.
    题型：数学计算
    解:
          9+99+999+9999+99999
        =108+999+9999+99999
        =1107+9999+99999
        =11106+99999
        =111105
    答案:9+99+999+9999+99999=111105
〖2/4算式〗
    作业：求算式 2+4+6+8+10+12+14+16+18+20 的值.
    题型：数学计算
    解:
          2+4+6+8+10+12+14+16+18+20
        =6+6+8+10+12+14+16+18+20
        =12+8+10+12+14+16+18+20
        =20+10+12+14+16+18+20
        =30+12+14+16+18+20
        =42+14+16+18+20
        =56+16+18+20
        =72+18+20
        =90+20
        =110
    答案:2+4+6+8+10+12+14+16+18+20=110
〖3/4算式〗
    作业：求算式 999*222+333*334 的值.
    题型：数学计算
    解:
          999*222+333*334
        =221778+333*334
        =221778+111222
        =333000
    答案:999*222+333*334=333000
〖4/4算式〗
    作业：求算式 2+4+6+8+10+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1 的值.
    题型：数学计算
    解:
          2+4+6+8+10+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1
        =6+6+8+10+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1
        =12+8+10+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1
        =20+10+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1
        =30+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1
        =42+14+16+18+20-19-17-15-13-11-9-7-5-3-1
        =56+16+18+20-19-17-15-13-11-9-7-5-3-1
        =72+18+20-19-17-15-13-11-9-7-5-3-1
        =90+20-19-17-15-13-11-9-7-5-3-1
        =110-19-17-15-13-11-9-7-5-3-1
        =91-17-15-13-11-9-7-5-3-1
        =74-15-13-11-9-7-5-3-1
        =59-13-11-9-7-5-3-1
        =46-11-9-7-5-3-1
        =35-9-7-5-3-1
        =26-7-5-3-1
        =19-5-3-1
        =14-3-1
        =11-1
        =10
    答案:2+4+6+8+10+12+14+16+18+20-19-17-15-13-11-9-7-5-3-1=10

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