Răspuns:
a) x+33=65
x=65-33
x=32
b) x-89=90
x=89+90
x=179
c) x÷11=11
x=11×11
x=121
d) 4x-1=15
4x=15+1
4x=16
x=16÷4
x=4
e) 6x+3=39
6x=39-3
6x=36
x=36÷6
x=6
f) 7x-1=69
7x=69+1
7x=70
x=70÷7
x=10
g) (13÷x-1)×13=0
13÷x-1=0
13÷x=1
x=13÷1
x=13
h) 14-x=10
x=14-10
i) (5x-7)÷3=11
5x-7=11×3
5x-7=33
5x=33+7
5x=40
x=40÷5
x=8
j) [(3x-2)×5-1]÷2+5=7
[(3x-2)×5-1]÷2=7-5
[(3x-2)×5-1]÷2=2
(3x-2)×5-1=2×2
(3x-2)×5-1=4
(3x-2)×5=4+1
(3x-2)×5=5
3x-2=5÷5
3x-2=1
3x=1+2
3x=3
x=3÷3
x=1
k) [(4x-2)÷6+9]÷4=4
(4x-2)÷6+9=4×4
(4x-2)÷6+9=16
(4x-2)÷6=16-9
(4x-2)÷6=7
4x-2=6×7
4x-2=42
4x=42+2
4x=44
x=44÷4
x=11
Explicație pas cu pas:
Sper ca te-am ajutat!
