Question

Раскройте скобки и найдите значение выражения -1,25-(6,5-(1,5+(-2 1/3+3 7/12)))

Answer 1

-1,25- (6,5-(1,5+(-2 1/3 +3 7/12))) = -1,25-(6,5-(1,5-2 1/3 +3 7/12))= -1,25- (6,5-1,5+ 2 1/3-3 7/12)= - 1,25 - 6,5+1,5-2 1/3+ 3 7/12= -7,75+1,5-  7/3 +43/12 =-625/100 - 7/3+43/12= (-1875-700) / 300= -103*25/12*25  +43*25/12*25=-103/12+43/12= -60/12=- 5
Проще по другому:
-1,25-(6,5-(1,5+(- 2 1/3 + 3 7/12))) = -1,25-(6,5-(1,5+ (-28/12+43/12)))= -1,25 -(6,5-(1,5+15/12)))= -1,25-(6,5-(1,5+1,25))= -1,25-(6,5-2,75)=-1,25-3,75= -(1,25+3,75)=-5