一道计算题接着脱式简便计算: 1/1*4+1/4*7+1/7*10+……+1/94*97+1/97*100= (1-1/

3个回答

  • (111+999)/〖56*(3/7-3/8)〗

    =111(1+9)/〔24-21〕

    =1110 /3

    =370

    200.5%+2.005*490+0.2005*5000

    =2.005+2.005×490+2.005×500

    =2.005×(10+490+500)

    =2.005×1000

    =2005

    3333*3333+9999*8889

    =3333×(3333+3×8889)

    =9999×(1111+8889)

    =9999×10000

    =99990000

    1/1*4+1/4*7+1/7*10+……+1/97*100

    =(1-3/4)+(3/4-5/7)+(5/7-7/10)+……+(65/97-67/100)

    =1-67/100

    =33/100