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( 1 - 5/9 ) + 1/6
4/9 + 1/6 = 11/18
el segundo
2/5 + ( 7/4 - 1/5 ) × 3/7
2/5 + 3/4 - 3/35
(56 + 105 - 12)/140
149/140
18-10+3/18=11/18
2/5+(7/4-1/5)×3/7=
2/5+(35-4/20)×3/7=
2/5+31/20×3/7=
2/5+93/140=56+93/140=149/140
Espero haberte ayudado.