50 / (200 + 50) = 1 / 5 = 0.2 = 20\% - концентрация соли в растворе
X:6+480=600
х:6=600-480
х:6=120
х=120×6
х=720
проверка
720:6+480=120+480=600
(7-10)^3= (-3)^3=-27
(6+(-10))*(6-(-10))=(6-10)*(6+10)= -4*16= -64
-8/9*(-27/33)+23/28*(-49/46)= 24/33- 7/8= 192/264-231/264= -39/264= -13/88
(4,5-6)*(1,8-(-3,4))= (4,5-6)*(1,8+3,4)= -1,5*5,2=-7,8
150*(200+600)=200*150+600*150=120000