(-2/5)+(-5/6)-(-4.9)-0.6=? (1-2)(3-4)(4-5)(5-6)...(103-104)怎
1+(-2)+(-3)+4+5+(-6)+(-7)+8+.+101+(-102)+(-103)+104
1+2+3+4+5+6+7+8+9.+100+101+102+103+104+105+106+107+108+109.1
1+2+3+4+5+.+100+101+102+103+104+105=?
求规律:1+2+3+4+5+6+7=规律 101+102+103+104+105+= 77+78+79+80+81+82
1+2+3+4+5+6=
1+2-3+4-5+6=
两道初一计算题①1-2+3-4+5-6……+2009-2010②(3-4)(4-5)(5-6)……(103-104)
8右6分之5+2.75+2右6分之1+7右4分之1=?4.9×5右2分之1+4.9+3右2分之1×4.9
已知三组数据甲:1,2,3,4,5;乙:101,102,103,104,105;丙:3,6,9,12,15;(1)分别求
5x/6-3/4(6x+5)+1=2/3(9x-5)+5
根据数列打成语1,2,3,4,5,6,72,4,6,8,103,4,5,6,7,8,91,3,5,7,91,4
2 3 4 5 6=6