1) 3(3х-1)+5=8(х+2)+3 2)-5(у-7)=30-(2у+1) 3)-4,5(х+3)-1=7,2-5(х-2)
9х-3+5=8х+16+3 -5у+35=30-2у-1 -4,5х-13,5-1=7,2-5х+10
9х+2=8х+19 -5у+2у=29-35 -4,5х-14,5=17,2-5х
9х-8х=19-2 -3у=-6 -4,5х+5х=17,2+14,5
х=17. у=2. 0,5х=31,7 х=63,4
4) 3(2,4т-3,5)+6=9,7т-3 5 5)1/3-4 2/9х=1/9(х-3)
7,2т-10,5+6,9=9,7т-35 1/3-4 2/9х=1/9х-1/3
7,2т-9,7т=-35+10,5-6,9 -4 2/9х-1/9х=-1/3-1/3
2,5т=-31,4 -4 1/3х=-2/3
т= 12,56 х=2/13
6) (3/5+3 5/6х)*(-6)=6-(3х-1 1/2)
-18/5-23х=6-3х+1 1/2
-23х+3х=6+1 1/2+18/5
-20х= 111/10
х=- 0,555
5 2/3 : 1/3 - 1 7/12 * 6 = 17/3 : 1/3 - 19/12 * 6 = 17/3 * 3 - 19/12 * 6 = 17 - 19/12 * 6 = 17 - 19/2
(17 × 2 - 19 × 1)/2 = (34 - 19)/2 = 15/2 = 7 1/2
7 1/2 = 7.5