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-7/3*(-27/28)=9/4=2,25
b) -3 3/8:5 1/16=
-27/8:81/16=
-27/8*16/81 = -2/3
c) -1 1/7*1 11/24:3/5 =
-8/7*35/24:3/5=
-5/3*5/3=
-25/9=-2 7/9
d) 3 1/2-3 1/6:(-2 1/9)=
7/2-19/6:(-19/9)=
7/2-19/6*(-9/19)=
7/2+3/2=
10/2=5