Question

Va rog mult!Testul 1 toate exercitiile!

Answer 1

1.
a ) [ 3/4 +2/3:(3/4-1/2)]*6/41
(3/4+2/3 :1/4)*6/41 =
(3/4+2/3*4/1)*6/41=
(3/4+8/3 )*6/41 =
41/12*6/41 = 1/2

b) [ 7/5:14/15+3/2:(9/4-1 1/2)] *2/7 =
[7/5:14/15 +3/2 :( 9/4 -3/2 )] *2/7 =
( 7/5:14/15+3/2:3/4)*2/7 =
(3/2 +3/2:3/4)*2/7 =
(3/2+2/1 ) *2/7 =
7/2*2/7 = 1

c) [ 5 2/3 +1,(5) -2 ] :15 2/3 =
(17/3 + 14/9 -2/1) :47/3 =
47/9 :47/3 = 1/3

d)
{ 4+6 2/3 - 2 1/4*[0,(6)-0,(2)]}:4 5/6 +7,25 =
[ 4+ 6 2/3 - 2 1/4*(6/9 -2/9 )] : 4 5/6 + 7,25
( 4 + 6 2/3 -2 1/4 * 4/9 ) : 4 5/6 +7,25 =
( 4 /1 + 20/3 - 4/9*4/9 ) : 29/6 +7,25 =
(4/1+20/3 - 16/81 ):29/6 +7,25 =
( 4/1+20/3-8/9 ) :29/6+7,25 =
88/9 : 29/6 + 7,25 =
176/87 +7,25 = 2,0 + 7,25 = 9,25

2.
a) 12,5 * 9 = 112,5
b) 7:28/13 = 4/13

3.
7*2/3+4*9/5 = 14/3+36/5 = 176/15

4.
L = 3 2/5 m = 17/5 m
l = 2 1/4 m= 9/4 m
A ➖ = L *L + l*l
= 17/5*2/1 + 9/4 *2 /1= 153 /20

5.
a) ( x+ 2 8/15 )*3/2 = 5 1/4
( x + 38/15)*3/2 = 21/4
x+38/15 = 21/4 : 3/2
x+38/15 = 7/2 - 38/15
x= 29/30

b)
2,18 :y = 109 /1000
y= 0,109: 2,18
y = 20

6.
1 1 /5 m = 6/5 m = 1,2 m ( 1 pantalon )
2 3/10 = 23/10 m= 2,3 m( 1 costum )
1,2m * 15 = 18 m ( 15 pantaloni )
2,3 m *8 = 18,4 m( 8 costume )
54 ,85 m - 18 m- 18,4 m= 18,45 m ( au rămas )
Sper că te-am ajutat și scuze că a durat atât