7/8х+6-15/8х=5
6-8/8х=5
6-х=5
х=6-5
х=1
1)25113:3+36985:5=8371+7397=15768
2)(568972-559423)*14:7=9549*14/7=133686/7=19098
3)256897+3564*25:10=256897+89100/10=256897+8910=265807
4)15768 < 19098 < 265807
1) 2 5/6 + 3 1/6 = (2+3) + (5/6 + 1/6) = 5 + 6/6 = 5+1 = 6.
С:4=54*8
С:4=432
С=432*4
С=1728
ПРОВЕРКА:
1728:4=54*8
432=432
(4-4)×4+4 = 0×4 +4= 0+4= 4