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4.8除括号152.4)简便

560除以十六除以括号152-1百四十七括号 =560÷16÷(152-147) =560÷16÷5 =560÷80 =7

29/24-(8/24-4/19) =29/24-8/24+4/19 =21/24+4/19 =7/8+4/19 =133/152+32/152 =165/152 =1又13/152

设n1=1/(2×5)=1/3(1/2-1/5) n2=1/(5×8)=1/3(1/5-1/8) …… n51=1/(152×155)=1/3(1/152-1/155) 则,n1+n2+n3+n4+……+n51=1/3(1/2-1/155) n2+n3+n4+……+n51=1/3(1/5-1/155) n3+n4+……+n51=1/3(1/8-1/155) …… n50+n51=1/3(1/149-1/155) ...

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