В)a<4+ab<3-a<3b-b<4=(a-b)(a+b)(a<2-ab+b<2)
г)x<4+x<3y-xy<3-y<4=(x+y)(x-y)(x<2+xy+y<2)
С^5·p^7
4,35·10² = 435
1/3 = 3^-1
1/3 = (1/3)^1
3у -2 = у+5
2у = 7
у = 3,5
7r -2 +11r -1 = 0
18r = 3
r = 1/6
1 ) х=4. 17.2-3.1х=4.8
3.1х=17.2-4.8
3.1х=12.6
х=12.6÷3.1
х=4 истинное. любое другое ложное