Răspuns :
Răspuns:
a) x+7=9
x=9-7
x=2
b) x-3=7
x=7+3
x=10
c) x-8=5
x=5+8
x=13
d) 14+x=31
x=31-14
x=17
e) 21-x=12
x=21-12
x=9
f) 43+x=-1
x=-1-43
x=-44
Răspuns:
a) X+7=9
X=9-7=2
b)X-3=7
X=7+3=10
c)X-8=5
X=8+5=13
d)14+X=31
X=31-14=17
f)21-X=12
X=21-12=9
g)43+X=-1
X=43-43=-1-43=-44