981＋982＋983＋·······987＝984×?
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/08 11:48:57
981＋982＋983＋·······987＝984×?981＋982＋983＋·······987＝984×?981＋982＋983＋·······987＝984×?981＋982＋983＋····
981＋982＋983＋·······987＝984×?
981＋982＋983＋·······987＝984×?
981＋982＋983＋·······987＝984×?
981＋982＋983＋·······987
=（981+987）+（982+986）+（983+985）+984
=2×984+2×984+2×984+984
=（2+2+2+1）×984
=984×7
4
8
981+987=984*2
982+986=984*2
……
（987+981）*（987-981+1）/2=984*7
981＋982＋983＋·······987＝984×?
函数y＝x²＋6x＋11的图像经过怎样的一次平移,可以得到y＝x²过程····································
如果3x＋9.8,那么15x减6等于（ ）·····打错了······················3x＋8等于9,那么15x减6等于（ ）
1＋2＋3+4+5········+n,=多少?
2003/1＋2003/2＋2103/3＋······＋2003/4005
二分之一＋六分之一＋十二分之一＋······＋九十分之一＝?
1/6×7＋1/7×8＋1/8×9＋······＋1/100×101=?请问有什么方法?
已知1＋2＋3＋···＋15＝14400,求2＋4＋6＋···＋30的值
（ 28 ＋ 7分之2 × 8分之7 ） × 4分之1 ＝ ? 高·手·进······················快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快·快
1＋2＋3＋4＋···＋n=?
····
·
·
·
····
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
··········
··········