32. Решите систему уравнений графическим
(3x-y=5,
1)
2)
2x+y=5;
2x+y=10. .
90 найтите пра чета
если поставлю лутший ответ​

104.

1) 37*218+63*218 = 218*(37+63) = 218*100 = 21800

2) 568*43-566*43 = 43*(568-566) = 53*2 = 106

3) 417*187+417*213 = 417*(187+213) = 417*400 = 166800

4) 52*187-52*43-52*44 = 52*(187-43-44) = 52*100 = 5200

105.

1) 359*a+641*17 при a=17

359*17+641*17 = 17*(359+641) = 17*1000 = 17000

2) 769*87-87b при b=369

769*87-87*369 = 87*(769-369) = 87*400 = 34800

106.

1) 5x+7x = 12x

2) 17a-9a = 8a

3) 34a-a = 33a

4) c+72c = 73c

5) 7x+8x+12c = 15x+12c

6) 53y+18y-24y = 47y

7) 14m+15m+16 = 29m+16

8) 69n-n-18 = 68n-18

9) 25x+37x-17x-x = 44x

107.

1) 37a+83a = 120a при а=8

120*8 = 960

2) 82b-28b = 54b при b=32

54*32 = 1728

3) 33c-6c-7c = 20c при c=549

20*549 = 10980

4) 17x-8x+23x-18 = 32x-18 при x=312

32*312-18 = 9966

108.

1) 2491:53 = 47

2) 5698:14 = 407

3) 9792:32 = 306

4) 23655:57 = 415

4sin3x·sin5x·sin8x=sin6x   ;   x∈[-π/2;7π/2] ⇔ x∈[-π/2;3π+π/2]
4sin3x·sin5x·s-n8x - 2sin3x·cos3x = 0 
sin3x(2sin5x·sin8x - cos3x) = 0 
    sin3x=0  ⇒  3x = πk   ⇒ x = π/3·k  ⇒
                         ⇒  x={0; π/3;2π/3;π;4π/3;5π/3;2π;7π/3}
 2sin5x·sin8x - cos3x =0  
 sinα·sinβ = 1/2[cos(α-β) - cos(α+β)]   ⇒ 
  (cos3x - cos13x) -cos3x =0   ⇒
    cos13x=0  ⇒  13x = +/-π/2 +2πn ; n ∈Z
         x=  +/- π/26 + 2πn/13  ; n∈ Z
             a)  -π/ 2 ≤ -π/26 +2πn/13≤7π/2  
             b)   -π/2 ≤  π/26 +2πn/13≤7π/2 
         n  находите  сами !