-28 + (-22) + (-8) = -55 - 3 = -58
- - - - - - - - - - - -
-14 - 32 - (-38) = -29 - (-21) = -8
- - - - - - - - - - - -
-78 - (-22) - (-23) = -(-63) - 96 = -33
17:(3/5+1/4)+(7/8-1/4)*(4/5)^2=
1)3/5+1/4=12/20+5/20=17/20
2)7/8-1/4=7/8-2/8=5/8
3)17:17/20=17/1*20/17=20
4)4/5*4/5=16/25
5)5/8*16/25=2/5
6)20+2/5=20 2/5
(А) Х/8+3/8=1Х/8+3/8=8/8х+3=8х=8-3х=5 (Б) Х/8-3/8=1Х/8-3/8=8/8х-3=8х=8+3<span>х=11</span>
1)18000÷6000×2000=6000 руб. на сапоги;
2)18000÷6000×1500=4500руб.- на ботинки;
3)18000÷6000×2500=7500 руб.- на туфли.