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А)<u /><em />√0.25*√64=0.5*8=4 б)√2*32=√64=8
1) 5 + sin a;
-1≤ sin a ≤ 1; +5
-1 + 5 ≤ sin a + 5 ≤1 + 5;
4 ≤ sin a + 5 ≤ 6.
E(y) = [4; 6];
2) 3 - cos a ;
- 1≤ cos a ≤ 1; *(-1)
-1 ≤ - cos a ≤ 1; +3;
- 1+3 ≤ - cos a + 3 ≤ 1+3;
2 ≤ 3 - cos a ≤ 4.
E(y) = [2; 4]
2х-12х-5х-30+6х-4=(10х+5)2+11
13х-34=100х+25+11
100х-13х=25+11-34
87х=2
х=43,5
1
b+(8a-b²)/b=(b²+8a-b²)/b=8a/b
a=-49,b=-80 8*(-49)/(-80)=4,9
2
(1/(7a)+1/(2a))*a²/4=(2+7)/(14a)*a²/4=9/(14a)*a²/4=9a/56
a=-2,8 9*(-2,8)/14=-1,8
3
(xy+y²)/(16x)*8x/(x+y)=y(x+y)/(16x)*8x/(x+y)=y/2
x=-6,3;y=-8,5 -8,5/2=-4,25
4
7a/(a-2b)(a+2b)-7/(a+2b)=(7a-7a+14b)/(a²-4b²)=14b/(a²-4b²)
a=8,b=3
14*3/(64-9)=42/55