Bonjour, quelques questions ! pour demain ! merci: 1) 19*27/34+75=??? 2) 43/75*12-5+72/47=??? 3) X*3=9 qui est X 4)7/4*5+9

Bonjour

1) 19*27/34+75

= 513/34 + (75 x 34) / (1 x 34)

= 513/34 + 2 550/34

= 3 063/34

2) 43/75*12-5+72/47

= 516/75 - 5 + 72/47

= (516 x 47) / (75 x 47)  - (5 x 3 384) / (1 x 3 384) + (72 x 75) / (47 x 75)

= 24 252/3 525 - 16 920/3 525 + 5 400/3 525

= 12 732/3 525

= (3 x 4 244) / (3 x 1 175)

= 4 244/1 175

3) X*3=9

3x = 9

x = 9/3

x = 3

4)7/4*5+9

= 35/4 + 9

= 35/4 + (9 x 4) / (1 x 4)

= 35/4 + 36/4

= 71/4.