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special-edu.kz.
special-edu.kz.

Ïî óñëîâèþ çàäà÷è, ñóììà âîçðàñòîâ special-edu.kz.

ñåñòðû è áðàòà ðàâíà 19. Ñîñòàâèì óðàâ-

íåíèå,
special-edu.kz. special-edu.kz. special-edu.kz.
(õ + 4) + (õ + 5 + 4) = 19.

2õ + 13 = 19,

2õ = 19 – 13,
2õ = 6,

õ = 3. Ñåñòðå 3 ãîäà.

3 + 5 = 8. Áðàòó 8 ëåò.

Ïðîâåðêà: (3 + 4) + (3 + 5 + 4) = 19,
special-edu.kz.
special-edu.kz. 7 + 12 = 19, special-edu.kz.

19 = 19.
Îòâåò: 3 ãîäà, 8 ëåò.

1. Êàêîå ðàâåíñòâî íàçûâàþò óðàâíå-

íèåì?
2. ×òî íàçûâàåòñÿ êîðíåì óðàâíå-
special-edu.kz. special-edu.kz. special-edu.kz.
íèÿ?

3. ×òî çíà÷èò ðåøèòü óðàâíåíèå?
4. Êàê íàéòè íåèçâåñòíîå ñëàãàåìîå?

5. Êàê íàéòè íåèçâåñòíûé ìíîæè-

òåëü?

127
special-edu.kz. special-edu.kz. special-edu.kz.