Explicație pas cu pas:
1) a)X+37=41
4+37=41(DA)
b)3X-2=10
3×4-2=
12-2=10(DA)
c)X:(-2)=2
4:(-2)=2(DA)
----------------------
2) a)X+3/2=2
1/2+3/2=4/2=>2 (DA)
b)1,5-X=1
15/10-1/2(amplificam cu 5)
15/10-5/10=10/10=>1 (DA)
c)2 1/2+X=2
5/2+1/2=6/2=>3 (NU)
--------------------------
5) a)X+7=11
X=11-7
X=4
b)X-8=17
X=17+8
X=25
c)X+4=17
X=17-4
X=13
d)X-5=14
X=14+5
X=19
e)15+X=8
X=8-15
X=-7
f)X-2=-7
X=-7+2
X=-5
g)X+31=9
X=9-31
X=-22
h)X-6=-5
X=-5+6
X=1
