a₄+a₁₀=24 a₇=?
a₁+3d+a₁+9d=24
2a₁+12d=24 |÷2
a₁+6d=12
a₇=12.
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a₄+a₁₀=24 a₇=?
a₁+3d+a₁+9d=24
2a₁+12d=24 |÷2
a₁+6d=12
a₇=12.
2а1+12d=24
а1+6d=24/2=12=а7
Ответ: 12