2/3+2/3÷4/3+1/5=
2/3+2/3×3/4+1/5=
2/3+1/2+1/5=
numitorul comun este 30
20+15+6/30=41/30
b)9÷1/9-801/9=
9×9-721/9=
81-721/9
numitorul comun este 9
729-721/9=8/9
c)(3/4+5/6-2/3)×12/5
numitorul comun este24
18+20-16/24)×12/5=
22/24×12/5= se fac simplificari=11/5
d)(33/55+77/99+17/45)×1994/1995=
numitorul comun este495
297+385-682/495)×1994/1995=
594/495×1994/1995=1184436/987525
e)(31/4+21/5-3/20)÷7/20=
(13/4+11/2-3/20)÷7/20=
(65+77-3/20)×20/7
139/20×20/7 se fac simplificari=139/7
f)93/25÷(71/5-31/10+61/2)=
228/25÷(36/5-93/10+13/2)=
numitorul comun este 30
228/25÷(216-93+195/30)=
228/25÷318/30=228/25×30/318= se fac simplificari=1368/1590
sucees
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