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12.a)(7/8-1/8)+1/4
=6/8+1/4
=6/8+2/8(1/4 se amplifica cu 2 că sa ajungi la un numitor comun)
=8/8
b)(5/6+7/6)-1/7
=12/6-1/7
=84/42-6/42
=78/42
=39/21
c)(7/3-4/3)-12/13
=3/3-12/13
=39/39-36/39
=3/39
=1/13
d)4/3-(9/11+2/11)
=4/3-11/11
=44/33-33/33
=11/33
=1/3
13.a)44/7-29/7=15/7
b)109/9-49/9=60/9
c)44/5-16/5=28/5
d)200/11-82/11=118/11
=6/8+1/4
=6/8+2/8(1/4 se amplifica cu 2 că sa ajungi la un numitor comun)
=8/8
b)(5/6+7/6)-1/7
=12/6-1/7
=84/42-6/42
=78/42
=39/21
c)(7/3-4/3)-12/13
=3/3-12/13
=39/39-36/39
=3/39
=1/13
d)4/3-(9/11+2/11)
=4/3-11/11
=44/33-33/33
=11/33
=1/3
13.a)44/7-29/7=15/7
b)109/9-49/9=60/9
c)44/5-16/5=28/5
d)200/11-82/11=118/11
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