Sagot :
bonjour
5 x - 12 = 8
5 x = 8 + 12
5 x = 20
x = 4
3 x+ 22 = 26
3 x = 26 - 22
3 x = 4
x = 4 /3
39.3 + 2 x = 129.3
2 x = 129. 3 - 39.3
2 x = 90
x = 45
7 x - 2 = 1.5
7 x = 1.5 + 2
7 x = 3.5
x = 0.5
Réponse :
bonjour
5x-12=8
5x=8+12
5x=20
x=20/5=4
verifions 5×4-12=20-12=8
3x+22=26
3x=26-22
3x=4
x=4/3
vérifions 3×4/3+22=12/3+22=4+22=26
39.3+2x=129.3
2x=129.3-39.3
2x=90
x=90/2=45
vérifions 39.3+2×45=39.3+90=129.3
7x-2=1.5
7x=1.5+2
7x=3.5
x=3.5/7=1/2
vérifions
7×1/2-2=7/2-2=3.5-2=1.5
Explications étape par étape