242+243+244+245+246+247 =(_+_)X_ =_X_ =_
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242+243+244+245+246+247 =(_+_)X_ =_X_ =_
242+243+244+245+246+247 =(_+_)X_ =_X_ =_
242+243+244+245+246+247 =(_+_)X_ =_X_ =_
小学三年级数学题
242+243+244+245+246+247
=(242_+247_)X_3
=489_X_3
=_1467
242+249×3
(242+7)×3
=249×3
=747
242+243+244+245+246+247 =(_+_)X_ =_X_ =_
九年级英语问题急求解答+++++++++++++++++++++++急求解答+++++++++++++++++++++++
111+222+333+444+555+666+777+888++++++++++++++++++++++999=?
上皮细胞+++是什么意思
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20 =
9999999999+999999999+99999999+99999+9999+999+99+9=?
2+4+6+8+10+……+48+50
2009+200.9+20.09+2.009+991+99.1+9.91+0.991
1+1+2+2+3+3+4+4二?
(2+4+6+.+98+100)-(1+3+5+.+97+99)
简便计算 一定要有过程.142/3 + 2/9 + 2/27 + 2/81 + 2/243
9+99+999+9999
(1+3+5+.+2001+2003+2005)-(2+4+6+.+2000+2002+2004)
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
1+2+...+999
111+11+1+1
99+999+9999+99999