1-2(x+2y)=5x+12y
6(х-4у)=5(3х+4у)-13
6(x-4y)=5(3x+4y)-13
6x-24y-(15x+20y)+13=0
-9x-44y+13=0
y=-(9x-13)/44
1-2(x+2y)=5x+12y
1-2(x+2*(-(9x-13)/44))=5x+12*(-(9x-13)/44)
1-13//11x-13//11-5x-12*(-(9x-13)/44)=0
-2//11-68//11x-12*(-(9x/44-13/44))=0
-2//11-68//11x-12*(-(9//44x-13//44))=0
-2//11-68//11x-(-27//11x+39//11)=0
-2//11-41//11x-39//11=0
-41//11-41//11x=0
x=(-41//11)/(41//11)
x=-1
6(x-4y)=5(3x+4y)-13
6((-1)-4y)=5(3*(-1)+4y)-13
-6-24y-5*(-3+4y)+13=0
-6-24y+15-20y+13=0
9-44y+13=0
22-44y=0
y=-(-22)/44
y=22/44
y=0.5
ответ: x=-1; y=0.5.
Выражение: 51*cos(4)/sin(86)+8
ответ: 51*cos(4)/sin(86)+8
По шагам:
1. 51*0.997564050259824/sin(86)+8
1.1. cos(4)=0.997564050259824
2. 50.875766563251/sin(86)+8
2.1. 51*0.997564050259824~~50.875766563251
X0.997564050259824
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _5_1_ _
0997564050259824
4_9_8_7_8_2_0_2_5_1_2_9_9_1_2_0_ _ _
50.875766563251024
3. 50.875766563251/0.997564050259824+8
3.1. sin(86)=0.997564050259824
4. 51+8
4.1. 50.875766563251/0.997564050259824~~51
50.875766563251000|0_._9_9_7_5_6_4_0_5_0_2_5_9_8_2_4_ _
4_9_8_7_8_2_0_2_5_1_2_9_9_1_2_0_ |50.9
9975640502598000
8_9_7_8_0_7_6_4_5_2_3_3_8_4_1_6_
997564050259584
5. 59
5.1. 51+8=59
а²+а-12=0
D=1+48-49 √D=7
a₁=(-1+7)/2=3 lgx=3 x₁=1000
a₂=(-1-7)/2=-4 lgx= -4 x₂= 1/10000
x₁*x₂=1000 *(1/10000)=1/10=0,1