2道数学简算

来源:百度知道 编辑:UC知道 时间:2024/06/17 07:51:43
1.三分之二+九分之二+二十七分之二+八十一分之二+二百四十三分之二
2.9.6 + 99.6 + 999.6 + 9999.6 + 99999.6
写过程!TMD
简算懂么?给咱弄出那么多个算式!

给你们看个例题:
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
=(1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/64)- 1/64
=1 - 1/64
=63/64

2/3+2/9+2/27+2/81+2/243
=2/3+2/9+2/27+2/81+(2/243+1/243)-1/243
=2/3+2/9+2/27+(2/81+1/81)-1/243
=2/3+2/9+(2/27+1/27)-1/243
=2/3+(2/9+1/9)-1/243
=2/3+1/3-1/243
=1-1/243
=242/243

9.6 + 99.6 + 999.6 + 9999.6 + 99999.6
=10-0.4+100-0.4+1000-0.4+10000-0.4+100000-0.4
=111110-0.4×5
=111108

1.
2/3+2/9+2/27+2/81+2/243
=2(1/3+1/9+1/27+1/81+1/243)
=2(9/27+3/27+1/27+3/243+1/243)
=2(13/27+4/243)
=2(13*9/243+4/243)
=2(117/243+4/243)
=2*121/243
=242/243

2.
9.6 + 99.6 + 999.6 + 9999.6 + 99999.6
=10-0.4+100-0.4+1000+0.4+10000-0.4+100000-0.4
=111110-0.4*5
=111110-2
=111108

1、2/3+2/9+2/27+2/81+2/243=2/243×(1+3+9+27+81)=2/243×121=242/243
2、9.6 + 99.6 + 999.6 + 9999.6 + 99999.6=(10-0.4)+(100-0.4)+(1000-0.4)+(10000-0.4)+(100000-0.4)=111110-2=111108

1:242/243
2:11119

不懂