Răspunsuri

2014-09-30T14:16:09+03:00
5x+20y+18=43(=)5x+20y=43-18(=)5x+20y=25(=)5(x+4y)=25(=)x+4y=5(=)15(x+4y)=75 (=)15x+60y=75(=)15x+60y+38=75+38(=)15x+60y+38=113
2014-09-30T14:19:08+03:00
5x+20y+18=43(=)5x+20y=43-18(=)5x+20y=25(=)5(x+4y)=25(=)x+4y=5(=)15(x+4y)=75 (=)15x+60y=75(=)15x+60y+38=75+38(=)15x+60y+38=113

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