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alena0505
@alena0505
August 2022
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найдите первый член и разность арифмитич.прогресии если а4=10
а7=19
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lmatem
A7=a4+d(7-4)
19=10+d*3
d=(19-10)/3=3-разность
a4=a1+d*(4-1)
10=a1+3*3-----> a1=10-9=1
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Answers & Comments
19=10+d*3
d=(19-10)/3=3-разность
a4=a1+d*(4-1)
10=a1+3*3-----> a1=10-9=1