b. 13.55+85.13+87.51+69.87?
c. 520 : {[(16.5 +2^2.5) :2-2]}+82}+2017^0=?
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c: \(=520:\left\{\left[\left(80+20\right):2-2\right]+82\right\}+1\)
\(=520:\left\{48+82\right\}+1\)
=4+1
=5
a: \(=100\cdot104=10400\)
d: \(=2\cdot9+4\cdot27=18+108=126\)
\(=13\left(55+85\right)+87\left(51+69\right)\)
\(=13\cdot140+87\cdot120\)
\(=12260\)
\(a.3\times2^3+3\times4^2\)
\(=3\times2^3+3\times\left(2^2\right)^2\)
\(=3\times2^3+3\times2^4\)
\(=3\times\left(2^3+2^4\right)=3\times\left(8+16\right)=3\times24=72\)
\(520:\left\{\left[\left(16\cdot5+2^2\cdot5\right):5-5\right]+115\right\}+2017^0\)
\(520:\left\{\left[\left(80-20\right):5-5\right]+115\right\}+1\)
\(520:\left\{\left[60:5-5\right]+115\right\}+1\)
\(520:\left(7+115\right)+1\)
\(520:122+1\)
\(=5,2\)
520 : { [ (16 x 5 + 22 x 5 ) ) : 5 - 5 ] + 115 } + 2017 0
= 520 : { [ (80 + 20) : 5 - 5 ] + 115 } + 1
= 520 : { [ 100 : 5 - 5 ] + 115 } +1
= 520 : { [ 20 - 5 ] + 115 } +1
= 520 : { 15 + 115 } +1
= 520 : 130 +1
= 4 + 1
= 5
\(B=1+3+3^2+3^3+...+3^{2017}\)
\(B=1+3\left(1+3+3^2+...+3^{2016}\right)\)
\(B=1+3\left(B-3^{2017}\right)\)
\(B=1+3B-3^{2018}\)
\(2B=3^{2018}-1\Rightarrow B=\frac{3^{2018}-1}{2}\)
c: \(=520:\left\{\left[\left(80+20\right):2-2\right]+82\right\}+1\)
\(=520:130+1\)
=4+1
=5
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