Răspuns :
Răspuns:
a) 61 b) 4 c)20 d) 9
Explicație pas cu pas:
a)
(19+x)=40×2
19+x=80
=>x=80-19=61
b)
(x+36)÷4=10
x+36=4×10=40
=>x=40-36=4
c)
(70-x):5=10
70-x=10×5=50
x=70-50
x=20
d)
(9x x):3=30
(9×x)=30×3=90
X=90÷10
X=9
Răspuns:
a) 61 b) 4 c)20 d) 9
Explicație pas cu pas:
a)
(19+x)=40×2
19+x=80
=>x=80-19=61
b)
(x+36)÷4=10
x+36=4×10=40
=>x=40-36=4
c)
(70-x):5=10
70-x=10×5=50
x=70-50
x=20
d)
(9x x):3=30
(9×x)=30×3=90
X=90÷10
X=9