<span>а)(3a-4ax+2)-(11a-14ax)=3a-4ax+2-11a+14ax=-8a+10ax+2.
</span><span>б)3y²(y³+1)=3y</span>²y³+3y²=3y²⁺³+3y²=3y⁵+3y².
Sn = a1+an\2 *n
S29 = (18,7 - 19,6\2) *29
S29= -13,05
Решение во вложенииииииииииииииииииииии
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