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29x29+71x29的简便算法

=29x(71+29) =29x100

72*29+72*71-71 72*100-71 7200-71 7129

71x29十29x29 =(71+29)x29 =100x29 =2900

简便计算 67x29+71x67 =67x(29+71) =67x100 =6700

=42×(29+71)÷35 =42×100÷7÷5 =600÷5 =120

=0.62x(71+29) =0.62x100 =62

29%x+71%x=2/3 解:100%x=2/3 x=2/3

29%x+71%x=2/3 解: 100%x=2/3

=1999*0.71+11*25*0.29+2224*0.29 =1999*(1-0.29)+11

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