299+1=300
409+1=410
959+1=960
1000+1=1001 1000-1=999 1000:1000=1 1000*10=10000
100000+1=100 001 100000-1=99 999 100000:1000=100 100000*10=1000000
1000000+1=100001 1000000-1=999 999 1000000:1000=1000 1000000*10=10000000
23/8=2. 7 ост. 41/16=2. 9 ост.
103/25=4. 3ост. 277/32=8. 21ост
-15-3х=-7х+45
- 3х + 7х = 45 + 15
4х = 60
х = 60÷4
х= 15
(4-с)+2(с-3)=-13.
4- с + 2с - 6 = -13
-с + 2с = - 13 - 4 + 6
с = - 11
-3х-17=8х-105.
- 17 + 105 = 8х + 3х
88 = 11х
х = 88÷11
х = 8
11+2х=55+3х
11 - 55 = 3х - 2х
- 44 = х