а1=-10, а2=х, а3=-14, а4=-16.
а2=а1+d. d=a4-a3=-16-(-14)=-16+14=-2. a2=-10+(-2)=-12. x=-12
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а1=-10, а2=х, а3=-14, а4=-16.
а2=а1+d. d=a4-a3=-16-(-14)=-16+14=-2. a2=-10+(-2)=-12. x=-12
x=–10–2=–12