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a) \(4.5^2-81:3^2=4.25-81:9=100-9=91\)
b) \(3^3.23-3^3.19=3^3.\left(23-19\right)=27.4=108\)
c) \(2^4.5-[131-\left(13-4\right)^2]=16.5-\left(131-9^2\right)=80-\left(131-81\right)=80-50=30\)
d) \(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-4.\left(125-25\right)\right]\right\}\)
\(=100:\left[250:\left(450-4.100\right)\right]\)
\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
24x5-[131-(13-4)2]
=24x5-[131-92]
=24x5-[131-81]
=16x5-50
=80-50
=30
\(2^4.5-\left[131-\left(13-4\right)^2\right]=16.5-\left[131-81\right]=80-50=30\)
72-36:32
=49-36:9
=49-4
=45
70-[60-(12-8)2]
=70-(60-42)
=70-(60-16)
=70-44
=26
24.5-[131-(13-4)2]
=16.5-(131-92)
=16.5-(131-81)
=16.5-50
=80-50
=30
\(2^4.5-\left[131-\left(13-4\right)^2\right]\)
\(=2^4.5-\left(131-9^2\right)\)
\(=2^4.5-\left(131-81\right)\)
\(=2^4.5-50\)
\(=16.5-50\)
\(=80-50\)
\(=30\)
24.5-[131-(13-4)^2]
=24.5-[131-81]
=16.5-50
=30