Răspuns:
ex. 2) x = 5 =>x= 4•5 = 20 = 20:2= 10=>x = 10;
4 2 2 2
9 = 3 => 9•2 = 18 = 18:3= 6 =>x= 6;
x 2 3 3
5 = x = 8•5 = 40:4=10 =>x= 10;
4 8 4
2 = 6 = 7•6 = 42 = 42:2= 21 =>x= 21.
7 x 2 2
ex. 3)
a) x = 13 = 4•13 = 52 = 52:3= 17(3) =>17(3);
4 3 3 3
b) 9 = 3 = 9•10 = 90 = 90:3=30 =>x= 30;
x 10 3 3
c) 7 = x = 16•7 = 112 = 112:8= 14 =>x= 14;
8 16 8 8
d) 5 = 15 = 6•15 = 90 = 90:5= 18 =>x= 18;
6 x 5 5
e) x = 4 = 15•4 = 60 = 60:5=12 =>x= 12;
15 5 5 5
f) 4 = 8 = 11•8 = 88 = 88:4=22 =>x= 22;
11 x 4 4
g) 24 = 6 = 24•5 = 120 = 120:5=24 =>x= 24;
x 5 5 5
h) 7 = x = 7•40 = 280 = 280:8= 35 =>x= 35.
8 40 8 8
Explicație pas cu pas:
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