упростите выражение (a+7)(a-1)+(a-3)^2

найти прикметники до іменника весна

2 целых 1/2х-1 целая 1/3х=4целых 2/3

Use between or among

1)Julia couldn`t choose ... two dresses.2)We spent last summer ... friends in Canada. 3) Elephats are ... the largest animals in the world. 4) The new American singer is popular .. young people. 5) I don`t like Paul very much, but that`s ... you and me. 6) The relover lay ... the two boxes. 7) The tents were situated ... the high trees. 8) There is a bridge ... the island and the bank of the river. 9) I had English and Geography class and lunch ... them. 10) You can choose ... cucumber salad and tomato salad/

РЕШИТЬ СИСТЕМУ:

a) 6u-7u=6

    7u-8u=15

б) 2m+5n=12

    4m+3n=10

в)8х-3у=22

   3х+4у=-2