1) 3с/5=-6/5 |•5
3c=-6
c=-2
2)b/3+1=2;|•3
b+3=6
b=3
3) 7x/8+2=-5/8|•8
7x+16=-5
7x=-21
x=-3
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 х 9 = 100
1 + 2 х 3 + 4 + 5 + 67 + 8 + 9 = 100
12 – 3 – 4 + 5 – 6 + 7 + 8 9 = 100
1 + 2 3 – 4 + 5 6 + 7 + 8 + 9 = 100
8 7/13 - 7 12/13 = 7 20/13 - 7 12/13 = 8/13
6 15/28 - (2 15/28 - 1 17/28) = 6 15/28 - 2 15/28 + 1 17/28 = 5 17/28
6 34/39 + 7 38/39 + 5 37/39 = 18 109/39 = 20 31/39
68 32/67 + 10 10/67 + 31 25/67 = 109 67/67 = 110
3.5\8*2.1\3-2.1\3*5\8-7*5\8=<span>2.5\8</span>
1)<span>3.5\8*2.1\3=29\8*7\3=203\24=8.11\24
2)</span><span>2.1\3*5\8=7\3*5\8=35/24=1.11\24
3)8.11/24-1.11/24=7
4)7*5\8=35/8=4.3/8
5)7-4.3/8=6.8\8-4.3\8=2.5\8</span>