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.
