\(A=1024:\left(17.2^5+15.2^5\right)\)

\(=1024:\left[2^5.\left(17+15\right)\right]\)

\(=1024:\left[32.32\right]\)

\(=1\)

\(A=\frac{1024}{17.2^5+15.2^5}=\frac{1024}{2^5.\left(17+15\right)}=\frac{1024}{32.32}=\frac{1024}{1024}=1\)

a) \(255+312+188+645\)

\(=\left(255+645\right)+\left(312+188\right)\)

\(=900+500\)

\(=1400\)

b) \(25+12\cdot5-60\)

\(=25+60-60\)

\(=25\)

c) \(12\cdot75+12\cdot7+12\cdot18\)

\(=12\cdot\left(75+7+18\right)\)

\(=12\cdot100\)

\(=1200\)

d) \(2^4\cdot5-\left[131-\left(13-4\right)^2\right]\)

\(=16\cdot5-\left(131-9^2\right)\)

\(=80-\left(131-81\right)\)

\(=80-50\)

\(=30\)

= 12.7 x (1+1+1+7) + (12,7 : 10 )

= 12,7 x 10 + 1,27

=127 + 1,27 

=128,27 

nhanh lên

= 37 . ( 28 + 82 ) + 63 . ( 69 + 41 )

= 37 .         100    + 63 .          110

= 3700                  +          6930

= 10630

hok tốt

37.28 + 37.82 + 63.69 + 63.41

= 37.(28+82) + 63.(69+41)

= 37.110 + 63.110

= 110.(37+63)

= 110.100

= 11 000

\(=-385\cdot149+385\cdot298-298\cdot149-298\cdot385-683\cdot851\)

\(=-683\cdot149-683\cdot851=-683000\)

a,(-418)-{-218-[100-(318+2012)]}

=(-418)-{-218-[100-2330]}

=(-418)-{-218-(-2230)

=(-418)-{-218+2230}

=(-418)-2012

= -2430

b,(351-875)-(125-149)

=(-424)-(-24)

=(-424)+24

= -400

a)(-418)-{-218-[100-(318+2012)]}

= -418+218-100+318+2012

=(-418-100)+(218+2012)+318

= -318+2230+318

=[(-318)+318)+2210

=0+2230

=2230

b) (351-875)-(125-149)

=351-875-125+149

=(351+149)-(875+125)

=500-1000

=-500

học tốt nhé

12,7 + 12,7 + 12,7 + 12,7 x 8 - 12,7

= 12,7 x (1 + 1 + 1 + 8 - 1)

= 12,7 x 10

= 127

(100 + 42) x 42 + (200 - 58) x 58

= 142 x 42 + 142 x 58 

= 142 x (42 x 58)

= 142 x 100

= 14200