Răspuns :
15²-5×[(5⁷)⁸:5³⁰+5×5²¹-5²⁶]:25¹⁰=
=225-5×(5⁵⁶:5³⁹+5²²-5²⁶):(5²)¹⁰=
=225-5×(5²⁶+5²²-5²⁶):5²⁰=
=225-5×5²²:5²⁰=
=225-5²³:5²⁰=
=225-125=100
15²-5×[(5⁷)⁸:5³⁰+5×5²¹-5²⁶]:25¹⁰=
=225-5×(5⁵⁶:5³⁹+5²²-5²⁶):(5²)¹⁰=
=225-5×(5²⁶+5²²-5²⁶):5²⁰=
=225-5×5²²:5²⁰=
=225-5²³:5²⁰=
=225-125=100