asup2u
幼苗
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设:2元,5元,10元分别有x张,x张,(50-2x)张.
2*x+5*x+10*(50-2x)=240
x=20
2元,5元,10元分别有20张,20张,10张
1年前
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asup2u
2*x+5*x+10*(50-2x)=240 7x+500-20x=240 500-13x=240 13x=260 x=20