170•у +390= 8100:9
памагите ​

24670+с=35782+34278       с=35782+34278-24670     с=45390   проверка    24670+45390=35782+34278    70060=70060                                                                                                              2)    77000-х=80008-56528    -х=800008-56528-77000     -х=-53520   х=53520                                                                                                                   проверка:   77000-53520=80008-56528    23480=23480                                                                                                                   3)18036м+968м-7095м=26099м=26км99м                                                                                 4) 52р8коп:4коп=13р02коп                                                                                        17м 6см176см                          3305 кг=33ц 05кг                 

1. 3 2/7×7 (3 2/7 переведем в неправильную дробь)=23/7×7(сокращаем на 7)=23
12 2/3×3=38/3×3=38
5 3/8×2=43/8×2= сокращаем на 2 получаем, 43/4=1 3/4=1,75
2.не знаю
3.
а) 5/6х+1/3х= общий знаменатель 3и 6 будет 6
5/6х+2/6х= 7/6=1 1/6х
б) 9/19х-5/19х=4/19х
в) 2 1/6z+2/3=2 1/6+4/6=2 5/6x
г) у-11/16у=1-11/16=16/16-11/16=5/16у
д) 1 5/18b+b=1 5/18+1=2 5/18
4.
а) 5/7х+9/7х=32
14/7х=2х=32
х=32:2=16
б) 3/4у+5/6у-7/12у=3(общий знаменатель 24)
18/24+20/24=38/24-14/24=24/24=1
у=3
5.
8/9m-1/3=39:27=1 12/27
8/9m=1 12/27+1/3=1 12/27+9/27=1 21/27
m=1 21/27:8/9=48/27×9/8=6/3=2
ответ: 2