设上衣进价x,裤子进价500-x
(1+50%)x*0.9+(1+40%)(500-x)*0.9-500=157
x=300
500-x=500-200=300
所以上衣进价300,裤子进价200元
设上衣进价x,裤子进价500-x
(1+50%)x*0.9+(1+40%)(500-x)*0.9-500=157
x=300
500-x=500-200=300
所以上衣进价300,裤子进价200元 (应该是这样的)!!!
谁能用二元一次方程解啊!!!!
设上衣进价x,裤子进价500-x
(1+50%)x*0.9+(1+40%)(500-x)*0.9-500=157
x=300
500-x=500-300=200