(590*35+598-34)*990=

(20650+598-34)*990=21214*990=21001860

(590*35+598 - 34)*990= (20650+564)*990=21214*990=21001860

(590 x 35 + 598 -34) x 990 = (20650 + 598 -34) x 990 = (21248 - 34) x 990 = 21214 x 990 = 21001860