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共回答了21个问题采纳率：81% 举报
1.135+3.346+5.557+7.768+9.979
=1.135+9.979+3.346+7.768+5.557
=11.114+11.114+5.557
=5.557*5
=27.785
=1.135+9.979+3.346+7.768+5.557
=11.114+11.114+5.557
=5.557*5
=27.785
1年前 追问
6
9.8+99.8+999.8+9999.8+99999.8 =(10-0.2)+(100-0.2)+(1000-0.2)+(10000-0.2)+(100000-0.2) =(10+100+1000+10000+100000)-5*0.2 =111110-1=111109 1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19 =(1.1+9.9) +(3.3+7.7)+5.5+(11.11+19.19)+(13.13+17.17)+15.15 这题与第一题类似 2.89X4.68+4.68X6.11+4.68 =4.68*(2.89+6.11+1)=4.68*10=46.8 提公因式
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