Răspuns:
289,48
Explicație pas cu pas:
3,2(1)·90+(1/3-1/5)²·3³=[(321-32)/90]·90+[(5-3)/15]²·3³=321-32+(2/15)²·3³=
=289+2²·3³/(3²·5²)=289+2²·3/(5²)=289+2²·2²·3/(2²·5²)=289+16·3/(10²)=
=289+48/(100)=289+0,48=289,48
