AVALDIS JA VÕRDUS. TÄHT VÕRDUSES.

Avaldised on summa, vahe, korrutis ja jagatis.
Avaldises võib arvu kohal olla täht: x, y, a, b, …
Võrduses hoiab arvu kohta tavaliselt täht x.

x + 17 = 28 x = 28 - 17 x = 11	45 - x = 13 x = 45 - 13 x = 32
36 : x = 2 x = 36 : 2 x = 18	x · 18 = 72 x = 72 : 18 x = 4

2. Leia tähe arvväärtus!

x + 14 = 35 x = ............................. ...................................	x - 7 = 49 ................................... ...................................	50 - x = 17 ................................... ...................................
24 : x = 8 .................................. ...................................	x : 6 = 10 .................................. ...................................	5 · x = 60 .................................. ..................................

3. Leia a ja b summa, kui

1) a = 36
b = 49;

2) a = 48
b = 28;

3) a = 16
b = 78.

Vastus:

1) a + b = ..........;

2) ........................;

3) ......................... .

4. Leia vahed.

1) 100 - 15 = ..........;

2) 100 - 24 = ..........;

3)100 - 6 = .......... .

Kontrolli, kas saadud vahed ja eelmise ülesande summad on võrdsed!
Vastus: ..........................................................................................................

5. Koosta ja lahenda tekstülesanne järgmise võrduse järgi: a + 19 = 46.
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Vastus: ..............................................................................................................................