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(1/4-5/36+4/1:3 1/4) x 1 1/12-1 5/12 : 1/9
(1/4-5/36+4/1 x 4/13) x 1 1/12-1 5/12 : 1/9
(1/4-5/36+16/13) x 13/12-17/12 : 1/9
1/4 - 5/36 +(16/13 x 13/12) - 17/12 :1/9
1/4 - 5/36+4/3 - (17/12 x 9/1)
1/4 - 5/36 + 4/3 - 51/4 = (9/36-5/36)+48/36-459/36=4/36+(-411/36)=4/36-411/36=-7/36.
b) -8[-0,75x4/3 -4/6x(-1.5)] : 1 1/3 x (-0.5)
-8 [-3/4 x 4/3 - 4/6 x (-1 1/12)] : 1 1/3 x (-1/2)
-8 [-1-4/6 x (-3/2)] : 1 1/3[(-1/2)]=
-8 [-1-(-1)]:1 1/3 x (-1/2)
-8[-1+1] : 1 1/3 x (-1/2)
-8 x 0 : 1 1/3 x (-1/2)
0 : 4/3 x (-1/2)=
0 : (-2/3)=0.
c) 2,5 x [8/15-(-0,15)] + 5/24 : [1,75+(-1 1/6)] : 2.625
2 1/2 x [8/15+0,15] + 5/24 : [1 3/4+(-1 1/6)] : 2.625
2 1/2 x (8/15+15/100) + 5/24 :(1 3/4 - 1 1/6) : 2.625
2 1/2 x (8/15+3/20)+5/24:(7/4-7/6) : 2.625
2 1/2 x (32/60+9/60)+5/24 : (42/24 - 28/24) : 2,625
2 1/2 x 41/60 + (5/24:14/24) : 2,625
2 1/2 x 41/60 + (5/24 x 24/14) : 2.625
(5/2 x 41/60)+ 5/14 : 2 5/8 = 41/24+ 5/14 : 21/8=41/24+5/14 x 8/21= 41/24+20/147=2009/147+20/147=2029/147=13 118/147