15,21-7,41*18,525+6,251)7,41*18,525=137, 27025
2)15,21-137, 27025=-122, 06025
3)-122, 06025+6,25=-115, 81025
15,21-7,41*18,525+6,25
1)7,41*18,525=137, 27025
2)15,21-137, 27025=-122, 06025
3)-122, 06025+6,25=-115, 81025