0.2222✘0.76+0.8888✘0.06用简便方法怎么算
简算.0.2222×0.76+0.8888×0.06 9.9+99.9+999.9+99...
简算.
0.2222×0.76+0.8888×0.06
9.9+99.9+999.9+9999.9+0.4. 展开
0.2222×0.76+0.8888×0.06
9.9+99.9+999.9+9999.9+0.4. 展开
展开全部
1、0.2222×0.76+0.8888×0.06
=0.2222×0.76+0.2222×4×0.06
=0.2222×0.76+0.2222×0.24
=0.2222×(0.76+0.24)
=0.2222×1
=0.2222
2、9.9+99.9+999.9+9999.9+0.4
=9.9+99.9+999.9+9999.9+0.1+0.1+0.1+0.1
=(9.9+0.1)+(99.9+0.1)+(999.9+0.1)+(9999.9+0.1)
=10+100+1000+10000
=11110.
=0.2222×0.76+0.2222×4×0.06
=0.2222×0.76+0.2222×0.24
=0.2222×(0.76+0.24)
=0.2222×1
=0.2222
2、9.9+99.9+999.9+9999.9+0.4
=9.9+99.9+999.9+9999.9+0.1+0.1+0.1+0.1
=(9.9+0.1)+(99.9+0.1)+(999.9+0.1)+(9999.9+0.1)
=10+100+1000+10000
=11110.
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