如题所述
42×101-42
=42×(101-1)
=42×100
=4200
201+99×12-1088
=201+100×12-12-1088
=201+1200-1100
=301追问
=42×(101-1)
=42×100
=4200
201+99×12-1088
=201+100×12-12-1088
=201+1200-1100
=301追问
二分之1加4分之1加8分之1加16分之1加32分之1呢?
追答1/2+1/4+1/8+1/16+1/32
=1/2+1/2-1/4+1/4-1/8+1/8-1/16+1/16-1/32
=1-1/32
=31/32
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第1个回答 2012-06-26
42*101-42
=42*(100+1)-42
=4200
201+99*12-1088
=201+(100-1)*12-1088
=201+1200-12-1088
=201+1200-(12+1088)
=1401-1100
=301
希望满意(⊙o⊙)哦追问
=42*(100+1)-42
=4200
201+99*12-1088
=201+(100-1)*12-1088
=201+1200-12-1088
=201+1200-(12+1088)
=1401-1100
=301
希望满意(⊙o⊙)哦追问
二分之1加4分之1加8分之1加16分之1加32分之1呢
追答1/2+1/4+1/8+1/16+1/32=1/2+(1/2-1/4)+(1/4-1/8)+(1/8-1/16)+(1/16-1/32)=1-1/32=31/32
第2个回答 2012-06-26
42*101-42=42*100
=4200
201+99*12-1088=201+100*12-12-1088
=201+1200-1100
=301
=4200
201+99*12-1088=201+100*12-12-1088
=201+1200-1100
=301