finamihai
A) 4/63+1/18-(2/5)²x5/7= 4/63+1/18-4/35=ducem la acelasi numitor 63=7x3² 18=3²x2 35=7x5 calculam cel mai mic multiplu comun [63,18,35]=7x2x3²x5=630 este numitorul comun 630;63=10 deci cu 10 amplificam I fractie 630:18=35 630:35=18 (4x10+1x35-4x18)/360= (40+35-72)/360=3/360=1/120
4/63+1/18-4/35=ducem la acelasi numitor
63=7x3²
18=3²x2
35=7x5
calculam cel mai mic multiplu comun
[63,18,35]=7x2x3²x5=630 este numitorul comun
630;63=10 deci cu 10 amplificam I fractie
630:18=35
630:35=18
(4x10+1x35-4x18)/360=
(40+35-72)/360=3/360=1/120
b)(1+3/2x5/2):6-1=
(1+15/2):6-1=
(2/2+15/2)x1/6-1=
(17/2)x1/6-1=
17/12-1=
17/12-12/12=5/12
c)(12/35-7/20)x(1-1/6)=
[(12x4-7x7)/140]x(6/6-1/6)=
[(48-49)/140]x5/6=
-1/140x5/6=-1/168
d)(6/32+5/24)x30/38-1/8=
(6x3+5x4)/96]x30/38-1/8=
[(18+20)/96]x30/38-1/8=
38/96x30/38-1/8=
15/48-1/8=
15/48-6/48=9/48=3/16
e)3-2:(5/8x12/15)+(1/3)²=
3-2:1/2+1/9=
3-2x1/2+1/9=
3-1+1/9=
2+1/9=
18/9+1/9=19/9
f)5/6:1/3:(12/8-5/6)=
5/6x3/1:(3/2-5/6)=
5/2:(9/6-5/6)=
5/2:4/6=5/2x6/4=15/8
g)3/4-1/12:1/4-(4/3-1/2)=
3/4-1/12x4/1-(8/6-3/6)=
3/4-1/3-5/6=
9/12-4/12-10/12=-5/12
h)4/3:2/9-(2-3/4)=
4/3x9/2-(8/4-3/4)=
6-5/4=
24/4-5/4=19/4
i)8/3-((14/20-1/15):3/10-8/15=
8/3-(7/10-1/15)x10/3-8/15=
8/3-(21/30-2/30)x10/3-8/15=
8/3-19/30x10/3-8/15=
8/3-19/9-8/15=
120/45-95/45-24/45=1/45
j)6/24+1/6-(15/6-3):3/2=
6/24+4/24-(15/6-18/6)x2/3=
10/24+3/6x2/3=
5/12+3=5/12+36/12=41/12