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Știind ca 5x +18+20y=43, determinați 15x +38+60y.

Răspuns :

Dariutza09
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
Cristealuisa359
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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