¡Algunos problemas matemáticos (aritmética elemental) pueden ser fáciles!
1. 3-1/3-1/3÷3
=3-1/3-1/9
=3-(3/9+1/9)
=23/9
2, 15/16+(7/16-1/4)÷1/2
=15/16+3/ 16÷1/2
=15/16+6/16
=21/16
3, 1/5÷[(2/3+ 1/5)*1/13]
=1/5÷[13/15*1/13]
=1/5÷1/15
=3
=3-1/3-1/9
=3-(3/9+1/9)
=23/9
2, 15/16+(7/16-1/4)÷1/2
=15/16+3/ 16÷1/2
=15/16+6/16
=21/16
3, 1/5÷[(2/3+ 1/5)*1/13]
=1/5÷[13/15*1/13]
=1/5÷1/15
=3