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=2 + 3/9 + 5/10 + 1 + 3/90 --->MCM(90)
=(180 + 30 + 45 + 90 + 3)/90
=348/90 ---->Simplificando 6ta
=58/15
2)
=4 + (86 - 8)/90 -( 1 + (34 - 3)/90)
=4 + 78/90 - 1 - 31/90 ---->MCM(90)
=(360 + 78 - 90 - 31)/90
=317/90
3)
=(1 + 6/9)(2 + 1/9)
=(15/9)(19/9) --->Simplificando tercia
=(5/3)(19/9)
=95/27
4)
=(7 + 6/9):(2 + 2/9)
=(69/9):(20/9) ----->Invirtiendo de división a multiplicación
=(69/9)x(9/20) -----> Simplificando 9
=69/20