20:(20+x)=25:28 lieshi
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20:(20+x)=25:28lieshi20:(20+x)=25:28lieshi20:(20+x)=25:28lieshi比例的内项乘积的等于外项乘积,所以25×(20+X)=20×28即25×2
20:(20+x)=25:28 lieshi
20:(20+x)=25:28 lieshi
20:(20+x)=25:28 lieshi
比例的内项乘积的等于外项乘积,所以
25×(20+X) = 20×28
即 25×20 +25X = 560
得 25X = 560 -500
所以 X = 12/5
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