Question

Ученик прочитал книгу за три дня.в первый день он прочитал 0.2 страниц и ещё 5 страниц.во второй день он прочитал 0.4 оставшихся страниц книги и ещё 7 страниц.в третий день он прочитал 0.8 остатка и ещё остальные 10 страниц.сколько всего страниц в книге ПОМОГИТЕОЧЕНЬ СРОЧНО!!!!

Answer 1

0,2х+5+0,32х+5+0,384х+2=х

0,904х+12=х

х-0,904х=12

0,096х=12

х=12:0,096

х=125 (стр.)

Ответ: 125 страниц в книге.

Answer 2

Calculation of Total Pages in the Book

To calculate the total number of pages in the book, we need to add up the number of pages read by the student each day.

On the first day, the student read 0.2 pages and an additional 5 pages, totaling 5.2 pages. On the second day, the student read 0.4 pages of the remaining pages and an additional 7 pages, totaling 7.4 pages. On the third day, the student read 0.8 pages of the remaining pages and an additional 10 pages, totaling 10.8 pages.

To find the total number of pages in the book, we need to subtract the additional pages read each day from the total number of pages read. Let's denote the total number of pages in the book as x.

Equation 1: 0.2 + 5 + 0.4(x - 5.2) + 7 + 0.8(x - 5.2 - 7.4) + 10 = x

Simplifying Equation 1, we get: 0.2 + 5 + 0.4x - 2.08 + 7 + 0.8x - 14.72 + 10 = x 1.2x - 4.6 = x

By subtracting x from both sides, we get: 0.2x - 4.6 = 0

By adding 4.6 to both sides, we get: 0.2x = 4.6

Finally, by dividing both sides by 0.2, we find: x = 23

Therefore, the total number of pages in the book is 23.