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$$
\overset{\land}{xOy} + \text{____} = \overset{\land}{xOz} \\[2ex]
\overset{\land}{xOz} - \text{____} = \overset{\land}{zOy} \\[2ex]
\overset{\land}{O}_2 + \overset{\land}{O}_1 = \text{____} \\[2ex]
\overset{\land}{xOz} - \overset{\land}{O}_1 = \text{____}
$$

پاسخ

$$
\overset{\land}{xOy} + \overset{\land}{yOz} = \overset{\land}{xOz} \\[2ex]
\overset{\land}{xOz} - \overset{\land}{yOz} = \overset{\land}{zOy} \\[2ex]
\overset{\land}{O}_2 + \overset{\land}{O}_1 = \overset{\land}{xOz} \\[2ex]
\overset{\land}{xOz} - \overset{\land}{O}_1 = \overset{\land}{O}_2
$$