❤❤❤ Răspuns:
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m(<A)=m(<C)=42 grade
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m(<B)=m(<D)=X grade
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suma masurilor unghiurilor unui paralelogram este 78
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m(<B)+m(<D)+m(<A)+m(<C)=78
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x+x+42+42=78
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2x+100=78
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2x=78-100
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2x=(-22)
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x=(-22)
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m(<B)=m(<D)=(-22) grade
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