Question

Tìm các chữ số dưới :

220,33 - ab,cd = abc,d

bài 2 : 90a,bc : a,bc = 721

abc + ab,c + a,bc = 217,56

Answer 1

ban j minh 200cm3=...cc nha

Answer 2

\(220,33-\overline{ab,cd}=\overline{abc,d}\)

\(\left(220,33-\overline{ab,cd}\right)\times100=abc\times100\)

\(22033-\overline{abcd}=\overline{abcd}\times10\)

\(22033=\overline{abcd}\times10+\overline{abcd}\)

\(22033=\overline{abcd}\times11\)

\(\overline{abcd=}22033\div11=2003\)

Answer 3

\(\overline{90a,bc}\div\overline{a,bc}=721\)

\(\overline{90a,bc}=721\times\overline{abc}\)

\(\overline{90abc}=721\times\overline{abc}\)

\(90000+\overline{abc}=721\times\overline{abc}\)

\(90000=721\times\overline{abc}-\overline{abc}\)

\(90000=720\times\overline{abc}\)

\(\Rightarrow\overline{abc}=\frac{90000}{720}=125\)