Question

用地等式计算（运用公式）

1. 1+3+9+27+81+243
2. 1+2+4+8+16+32+64
3. 1+2+4+5+7+8+10+11+13+14+16+17
4. 1+5.3+5.7+5.9+6.3+6.5+6.9+7.1
5. 122+222+322+422+522+622
6. 133+233+333+433+533+633
7.

Answer 1

1：原式=[1*（1-3^6）]/(1-3)
=(1-729)/-2
=-728/-2
=364
2:原式=[1*(1-2^7)]/(1-2)
=(1-128)/-1
=127
3:原式=3+9+15+21+27+33
=(3+33)*6/2
=36*3
=108
4:原式=1+5.3*7+0.4+0.6+1+1.2+1.6+1.8
=1+37.1+1+1+3+1.6
=38.1+6.6
=44.7
5:原式=100+200+300+400+500+600+22*6
=(100+600)*6/2+132
=700*3+132
=2100+132
=2232
6:原式=100+200+300+400+500+600+33*6
=(100+600)*6/2+198
=700*3+198
=2100+198
=2298

Answer 2

不知道