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1,2=6/5
0,8=4/5
0,3=3/10
0,4=2/5
Entonces nos queda, lo sig que separaremos en termino:
3(6/5)+4/5:2-8(1/4+1/2)+3/10-2/5
18/5+2/5-8.(3/4)+3/10-2/5
18/5+2/5-6+3/10-2/5
18/5-6+3/10
-12/5+3/10=-21/10 o -2,1