\(a,\left(-0,25\right).\dfrac{4}{7}.4.\dfrac{7}{4}=\left(-0,25.4\right).\left(\dfrac{4}{7}.\dfrac{7}{4}\right)=\left(-1\right).1=-1\)
\(b,0,55.73+2,2.1002+0,55.27-2,2.2\)
\(=\left(0,55.73+0,55.27\right)+\left(2,2.1002-2,2.2\right)\)
\(=0,55.\left(73+27\right)+2,2.\left(1002-2\right)\)
\(=0,55.100+2,2.1000\)
\(=55+2200\)
\(=2255\)
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