merçi de m'aider calculer er donner une fraction A)- -11/15 X-27/33x 25/-4 b) -4 /18 x -12 /35 x 48/3 c) 54/-42 x -48/63x 14/5 d) -36/51x 34/-12 x 8/3 EX 2) pos

--11/15 X -27/33 X 25/-4
+ 11/15 X -27/33 X 25/-4
-297 / 495 X 25/-4
-7425/ -1980 = +7425/1980 = 1485/396 = 165/44 

-4/18 X -12/35 X 48/3
+ 48/630 X 48/3
2304/ 1890 = 652/ 945 

54/-42 X -48/63 X 14/5
- 2592 / 2646 X 14/5
-1296 / 1323
432/411
144/137 X 14/5 = 2016/ 685

-36/51 X 34/-12 X 8/3
1224/ 612 X 8/3
9792 / 1836 = 1088 / 204 = 544/102 = 272/51 

Exercice 2
2/3 -4/3 X 5/2 
2/3 -20/6
2/3 X 2/2 -20/6
4/6 -20/6 = -16/6 = -8/3

5 + (1 + 1/8) / 3/4
5 + ( 8/8 +1/8) / 3/4
5 + 9/8 X 4/3
5 + 36/24
120/24 + 36/24 
156/24 = 52/8 = 26/4 = 13/2

A)- -11/15 X-27/33x 25/-4
A = 11*27*25 / (15*33*4) = 11*3*9*5*5 / (3*5*3*11*4)  = 15/4
b) -4 /18 x -12 /35 x 48/3
B = 4*12*48/(18 * 35 *3) = 4*4*3*3*2*8/(3*3*2 * 7 * 5 * 3) = 4*4*8 / (7*5*3) = 128/105 = 1,219047619...
c) 54/-42 x -48/63x 14/5
C = 54 *48 * 14 / (42*63*5) = 9*6*6*8*7*2/(7*6*9*7*5) = 6*8*2 /(7*5) = 96/35 = 2,742857143...
d) -36/51x 34/-12 x 8/3
D = 36*34*8/(51*12*3) = 12*3*17*2*4*2/(17*3*12*3) = 2*2*4/(3) = 16/3 = 5.3333333...
EX 2)
pose et mettre sous la forme d'une fraction
a=2/3- 4/3 x 5/2 ET B= 5+(1+1/8) : 3/4
A = 2/3 - 4/3 * 5/2 = 2/3 - 4*5/(2*3) = 2/3 - 20/6 = 2/3 - 10/3 = (2-10)/3 =) -8/3
B = 5+(1+1/8)/ (3/4) = 5+ (8/8+1/8)*(4/3) = 5+ 9/8*4/3 = 5 + 9*4/(8*3) = 5 + 3/2 = 5*2/(2) + 3/2 = 10/2 + 3/2 = 13/2