90,3-56,12:(50-31,6)·5,7

1)50-31,6=18,42)56,12:18,4=3,053)3,05*5,7=17,38590,3-17,385=72,915

90.3-56.12:(50-31.6)*5.7= 72.9151) 50 - 31.6 = 18.42) -56.12 : 18.4 = -3.053) -3.05 * 5.7 = -17.3854) 90.3 - 17.385 = 72.915