Explicație pas cu pas:
1. a) 3,524-2,19=1,334;
b)4,25·10=42,5;
c)52:0,1=520;
d)0,2³=0,008.
2. a) (0,2+0,8·0,1):0,001=0,28:0,001=280;
b) (0,4+3/5):0,5=(2/5+3/5):2/5=5/5:2/5=5/5·5/2=25/2.
3. 3,25·1,5=4,875;
6,12:1,5=4,08;
45:1,5=30;
5,05·1,5=7.575.
4. a) (2,3+5,8)/2=8,1/2=4,05;
b) (a+a+1+a+2+a+3+a+4)/5=12
(5a+10)/5=12
5a+10=60
5a=50
a=10;
a+1=11;
a+2=12;
a+3=13;
a+4=14.
Succes!
