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20×4-1×9/4×1=
80-9/4=
71/4
porque utilizamos el metodo sonrisa
2) 12/5+31/10= 155+120/50 = 123.1
3) 9/2+15/5= 45+30/10=7.5
4) 12/9-1/3=36-9/27= 1
la (carita. feliz )