Resposta :
a) 7×-5×=12+33
2×=45
×=45/2
b) 5×-30+15=20
5×=35
×=7
c) 7×+14=6×-9+15
×=-23+15
×=-8
d) 8×+8=3×+33
5×=41
×=41/5
2×=45
×=45/2
b) 5×-30+15=20
5×=35
×=7
c) 7×+14=6×-9+15
×=-23+15
×=-8
d) 8×+8=3×+33
5×=41
×=41/5