Úloha ID 772 - 
U stánku zaplatíme za kilo hrušek H Kč a za kilogram jablek J Kč. Přitom platí vztah 90 − 2J = H.
Které z následujících tvrzení vyplývá z uvedeného vztahu?
Správná odpověď je: D
Zadaná rovnice: 90 − 2J = H;
Vynásobením dvěma dostaneme cenu za 2 kila hrušek: 2H = 2 * (90 − 2J).
My se ale snažíme určit cenu za dva kilogramy hrušek a čtyři kilogramy jablek tedy:
2H + 4J = 2 * (90 − 2J) + 4J = 180.
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