Question

简便运算：9.6+99.6+999.6+9999.6+99999.6=

Answer 1

解：原式=9.6+9.6+9.6+9.6+9.6+90+990+9990+99990
=5x9.6+4x90+3x900++2x9000+90000
=48+360+2700+18000+90000
=111108.

Answer 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)=111110-0.4X5 =111108

Answer 3

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

= 10 +100 +1000 +10000 +100000-0.4× 5

= 111110-2
= 111108

Answer 4

(10 - 0.4) + (100 - 0.4) + (1000 - 0.4) + (10000 - 0.4) + (100000 - 0.4)
=111110 - 0.4 * 5
=111110 - 2
=111100 + 10 - 2
=111100 + 8
=111108

Answer 5

（10-0.4）+(100-0.4)+(1000-0.4)+(10000-0.4)+(100000-0.4)
=111110-0.4*5

这样做