1.(x,y)=(10,5) 2.(x,y)=( -1, -2) 3.(x,y)=( -5,0) 4.(x,y)=(5,1)
Объяснение:
1.
1.2(3+2y)+y=-4 1.-5+y-3y=-5 1.
2.3x-4*5=10 2.y=-2 2.y=0 2.3(7-2y)-4y=11
3.x=10 3.x=3+2(-2) 3.x=-5+0 3.y=1
4.x=-1 4.x=-5 4.x=7-2*1
5.x=5
3sin^2 2x + 10sin2x + 3 = 0
1) sin 2x =t
2) 3t^2 + 10 t + 3 =0
D= 10^2 - 4×3×3 =100-36=64=8^2
t1= -10-8/6=-18/6=-2
t2= -10+8/6=-2/6=-1/3
3) sin2x = -2
sin2x = - 1/3