1. a)5 < m < 15; 5*1/5 < 1/5 m < 15*1/5; 1 < 1/5 < 3
b) 5 < -2m < 15; 5*(-2) < -2m < 15*(-2); -10 < -2m < -30; -30 < -2m < -10
c) 5 < m-6 < 15; -5+6 < m-6 < -15+6 ; 1 < m-6 < -9; -9< m-6 < 1
2. a) 2.6 <√7 <2.7; 2.6*2 < 2√7 < 2.7*2 ; 5.2 < √7 < 5.4
b)- 2.6 <-√7 < -2.7; -2,7 < -√7 < -2,6
c) 2.6 <√7 <2.7; 2+2.6 < 2+√7 < 2+2.7; 4.6 < √7 < 4.7
d)2.6 <√7 <2.7; 3-2.6 < 3-√7 <3-2.7; 0.4 <;3-√7 <0.3; 0.3 < 3-√7 < 0.4
1. a)5 < m < 15; 5*1/5 < 1/5 m < 15*1/5; 1 < 1/5 < 3
b) 5 < -2m < 15; 5*(-2) < -2m < 15*(-2); -10 < -2m < -30; -30 < -2m < -10
c) 5 < m-6 < 15; -5+6 < m-6 < -15+6 ; 1 < m-6 < -9; -9< m-6 < 1
2. a) 2.6 <√7 <2.7; 2.6*2 < 2√7 < 2.7*2 ; 5.2 < √7 < 5.4
b)- 2.6 <-√7 < -2.7; -2,7 < -√7 < -2,6
c) 2.6 <√7 <2.7; 2+2.6 < 2+√7 < 2+2.7; 4.6 < √7 < 4.7
d)2.6 <√7 <2.7; 3-2.6 < 3-√7 <3-2.7; 0.4 <;3-√7 <0.3; 0.3 < 3-√7 < 0.4
Поделитесь своими знаниями, ответьте на вопрос:
4x+4y=6x-6y, 2x=10y
2x=55-y, 2x=10y
55-y=10y, 11y=55, y=5
2x=10.5,2x=50,x=25
x+y=25+5=30,x+y=30