Ответ:

541.

1) 5/3

2) 13/6

542.

1) S = 9/16 см² P = 3 см

2)S=25/36 см² P=10/3 см

3)S=8100 см² P=360 см

4) S=2500/9 см² P=200/3 см

Пошаговое объяснение:

541.

1. 1*(2/9) / 3*(2/3) + 4*(2/5)/(7/10 + 2*(3/5))-(3/17 - 1*(16/17 / 11))=

=(1*9+2)/9  /  (3*3+2)/3 + (4*5+2)/5 / (7/10 + (2*5+3)/5) - (3/17 - (17+16)/17 / 11 )=

=11/9 / 11/3 + 22/5 / (7/10 + 13/5) - (3/17 - 33/17 / 11) =

= 11/9  *  (3/11) + 22/5 / (7/10 + 26/10) - (3/17 - 33/(17*11))=

=1/3 + 22/5 / (33/10) - (3/17 - 3/17)=

=1/3 + 22/5 * (10/33) - 0 =

=1/3 + (22*10)/(5*33) =

= 1/3 + 2*2/3 =

= 1/3 +4/3

= 5/3

2. 5/6 + 2*(3/4) / 4*(8/9) * 2*(2/3) - 1*(2/3) + (5/38 *1*(1/3) - 10/57)=

=5/6 + 11/4 / (44/9) *  8/3 - 5/3 + (5/38 *4/3) - 10/57)=

=5/6 + (11*9)/(4*44) * 8/3 - 5/3 +(10/57 -10/57)=

=5/6 + 9/(4*4) * 8/3 - 5/3 + 0 =

=5/6 + 9/8 * 8/3 - 5/3 =

=5/6 + 3 - 5/3=

=5/6 +3 - 10/6 =

= -5/6 + 3 =

=-5/6 +(3*6)/6

=-5/6 + 18/6=

=(18-5)/6=

=13/6

542.

S=a² - формула площади квадрата

P=4*a - формула периметра квадрата

1 м = 100 см

1 дм = 10 см

1) S=3/4 * 3/4 = 3*3 / (4*4) = 9/16 см² P=4*3/4 = 12/4 = 3 см

2)S=5/6 * 5/6 = 25/36 см² P=4*5/6=20/6=10/3 см

3) 9/10 м = 0,9 м = 90 cм

  S=90 * 90 = 8100 см² P=4*90=360 см

4) 1*(2/3) дм = 5/3 дм = 50/3 cм

   S=50/3 * 50/3 = 2500/9 см² P= 4* 50/3 = 200/3 см