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\(=\frac{1}{\sqrt{1}+\sqrt{5}}+\frac{1}{\sqrt{5}+\sqrt{9}}+...+\frac{1}{\sqrt{957}+\sqrt{961}}\)
\(=\sqrt{5}-\sqrt{1}+\sqrt{9}-\sqrt{5}+...+\sqrt{961}-\sqrt{957}\)
\(=-\sqrt{1}+\sqrt{961}=\sqrt{961}-1=31-1=30\)
\(\hept{\begin{cases}\\\\\end{cases}\hept{\begin{cases}\\\end{cases}}\frac{ }{ }\sqrt[]{}\sqrt{ }\orbr{\begin{cases}\\\end{cases}}}\)
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100+653-100+953-1000
= 753-100+953-1000
= 653+953-1000
= 1606 - 1000
=606
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\(\frac{4x\left(2x29x39+2x59x79\right)}{9x29x39+9x59x79-29x39-59x79}\) =
\(\frac{8x29x39+8x59x79}{29x39x\left(9-1\right)+59x79x\left(9-1\right)}\) =
\(\frac{8x29x39+8x59x79}{29x39x8+59x79x8}\)= \(1\)
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21 31 + − 16 7 + 44 53 + 10 31 + 9 53 = ( 21 31 + 10 31 ) + ( 44 53 + 9 53 ) + − 16 7 = 1 + 1 + − 16 7 = − 2 7
=43 930
ht
43930 nha
k mk đi