Răspunsuri

2014-10-01T19:46:25+03:00
5x+20y=43-18=25, 5x+20y=25 => x+4y= 5
15(x+4y)+38= 15* 5+ 38 = 113
multuumesc!!!
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2014-10-01T19:56:43+03:00
5x+18+20y=43
15x+38+60y=?

5x+18+20y=43
5x+20y=43-18
5x+20y=25

15x+38+60y
=3·5x+3·20y+38
=3(5x+20y)+38
=3·25+38
=75+38
=113
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