500 + 490 + 480 + ... + 320 + 310 + 300
Added by Diane B.
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Step 1: Add 500 + 490 + 480 = 1470 Show more…
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$P(t)=60 t^{2}-t^{3}$ $P^{\prime}(t)=120 t-3 t^{2}=900$ $\Rightarrow t^{2}-40 t+300=0$ $t=10,30$
T=20+30+42+56+...+2550
Hoan N.
$$ \begin{array}{l} \frac{t}{6 t-12}-\frac{5}{2 t+10} \\ =\frac{t^{2}-23 t+70}{12 t^{2}+36 t-120} \end{array} $$
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