Цифри від 1 до 9 записуються в ряд у довільному порядку. Знайдіть ймовірність того, що: а) цифри 2 і 5 опиняться поряд; б) непарні цифри займуть непарні місця; в) сума цифр, які стоять на однаковій відстані від кінців ряду, дорівнює 10.
1 "Where do you live?" -Sue asked him. Косвенная речь:Sue asked him"Where do you live?"
2 "Have you done your homework?" -mom asked me. Косвенная речь:Mom asked me "Have you done your homework?"
3 "Will you go to the cinema tomorrow?" - asked Robert from his sister. Косвенная речь:Robert asked from his sister "Will you go to the cinema tomorrow?"
4 Mom asked from her daughter:"How many grades did you get yesterday?"
"How many grades did you get yesterday?" - asked mom from her daughter.
5 Anna asked me:"What music do you listenning now?" "What music do you listenning now?" - asked me Anna
1 "Where do you live?" -Sue asked him. Косвенная речь:Sue asked him"Where do you live?"
2 "Have you done your homework?" -mom asked me. Косвенная речь:Mom asked me "Have you done your homework?"
3 "Will you go to the cinema tomorrow?" - asked Robert from his sister. Косвенная речь:Robert asked from his sister "Will you go to the cinema tomorrow?"
4 Mom asked from her daughter:"How many grades did you get yesterday?"
"How many grades did you get yesterday?" - asked mom from her daughter.
5 Anna asked me:"What music do you listenning now?" "What music do you listenning now?" - asked me Anna
Пошаговое объяснение:
{х-8у-17=0
{3x+4y-23=0
х=17+8у
3(17+8у)+4y-23=0
51+24у+4у=23
28у=23-51
28у=-28
у=-1
х=17+8*(-1)=17-8=9
(2)
{8x-9y-21=0
{3x-2y-12=0
3x-2y-12=0
3х=12+2у
х=(12+2у)/3
8(12+2у/3)-9y-21=0
(96+16у-27у)/3=21
96-11у=21*3
11у=96-63
11у=33
у=3
х=(12+2*3)/3=18/3=6
N1548
(2)
{0.3x-0.5y=0
{0.1x+2y=6.5
0.1x+2y=6.5
0,1х=6,5-2у
х=(6,5-2у)/0,1
х=(6,5-2у)*10
0.3(6,5-2у)*10 -0.5y=0
3(6,5-2у) -0.5y=0
19,5-6у-0,5у=0
6,5у=19,5
у=3
х=10(6,5-2*3)=10*0,5=5
(4)
{0.7x+6y=27.9
{1.5x-2y=-14.5
1.5x-2y=-14.5
2у=1,5х+14,5
у=(1,5х+14,5)/2
0.7x+6(1,5х+14,5)/2=27.9
0.7x+3(1,5х+14,5)=27.9
0,7x+4,5х+43,5=27,9
5,2х=27,9-43,5
5,2х=-15,6
х=3
у=(1,5*3+14,5)/2=19/2=9,5