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15-5×[(5⁷)⁸:5³⁰+5×5²¹-5²⁶]:25¹⁰
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Deea4693ask

15-5×[(5⁷)⁸÷5³⁰+5×5²¹-5²⁶]÷25¹⁰

=15-5×(5⁵⁶÷5³⁰+5×5²¹-5²⁶)÷25¹⁰

=15-5×(5⁵⁶÷5³⁰+5×5²¹-5²⁶)÷5²⁰

=15-5×(5²⁶+5×5²¹-5²⁶)÷5²⁰

=15-5×(5×5²¹)÷5²⁰

=15-5×5²²÷5²⁰

=15-5×5²

=15-125

=110

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