73.98 - 73.46 - 52.143 = 73 ( 98 - 46 ) -52.143 = 73.52 - 52.143 = 52 ( 73 -143 ) = 52.( -70) = -3640
\(73.98-73.46-52.143\)
\(=\)\(73.\left(98-46\right)-52.143\)
\(=\)\(73.52-52.143\)
\(=\)\(73.52-52.143\)
\(=\)\(52.\left(73-143\right)\)
\(=\)\(52.\left(-70\right)\)
\(=\)\(-3640\)