Найдите значение выражения 6,7n-3,4n+2,9, если n=0,8.
19. Решите уравнение: а) 4,2х+1,7х-1,5х=7,92: б) у+3,54=8,2; в) (у-3,48)+2,15=3,9, г) (х+2,4):8=2,3;
д) (3,5-х)•6=1,2; е) 8х – 3,2=5,6;
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