1) -122*83-61*46-(-6)*122=61*(-2*83-46-(-6)*2)=61*(-166-46+12)=61*(-200)=-12200
2) 68*(-2*57-36-50)=68*(-200)=-13600
Ответ:
1) -12200
2) -13600
Пошаговое объяснение:
1) -122*83-61*46-(-6)*122 = -61 (2*83 + 46 - 6*2) = -61 (166+46-12) = -61 * 200 = -12200
2) -136*57-68*36-50*68 = -68 (2*57 + 36+50) = -68 * (114+36+50) = -68 * 200 = -13600
(450 :х+50):70=2
(450 :х+50)=2* 70
450 :х+50=140
450 :х = 140 - 50
450 :х = 90
х = 450 : 90
х = 5
z=x²-xy+y²+9x-6y+20 ∂z/∂x=2x-y+9 ∂z/∂y=-x+2y-6 2x-y+9=0 -x+2y-6=0 2x-y+9=0 3y-3=0 => y=1, x=-4 ∂²z/∂x²=2=A ∂²z/∂x∂y=0=B ∂²z/∂y²=2=C Δ=AC-B²=4 > 0, A > 0 Zmin(-4;1)=16+4+1-36-6+20=-1
21865+783=22648
12511-7958=4553
6500-2385=4115
8947+16496=25443