Question

Efectuati:
4/63+1/18-(2/5)la a 2 a·5/7=
(1+3/2·5/2):6-1=
(12/35-7/20)·(-1-1/6)=
(6/32+5/24)·30/38-1/8=
3-2:(5/8·12/15)+(1/3)la a 2 a=
5/6:1/3:(12/8-5/6)=

Answer 1

4/63+1/18-(2/5)la a 2 a·5/7=
4*2/126+1*7/126-(4/(5*5)·5/7=
15/126-4/35=
15/(2*9*7)-4/(7*5)=
(15*5-4*18)/2*5*7*9=
(45-116)/630=
-71/630

(1+3/2·5/2):6-1=(1+15/4):6-1=[(4+15)/4]*1/6-1
=19/4*1/6-1
=(19-24)/24
=-5/24

(12/35-7/20)·(-1-1/6)=12/(7*5)-7/(2*2*5)*[(-6-1)/6]
=(48-49)/140*(-7/6)
=-1/140*(-7/6)
=1/20*(-1/6)
= -1/120

(6/32+5/24)·30/38-1/8=
(6/8*4+5/6*4)*(30*8-38)8*38=
[(36+40)/6*8*4]*(240-38)/304=
76/192*202/304=15352/58368=7676/29184=3838/14592=1919/7296

5/6:1/3:(12/8-5/6)=
=5/6*3/1:(72-40)/48
=5/2:32/38
=5/2:16/19
=5/2*19/16
=95/32