Bài 1: Tìm x:
10 - x = 0,9 + 0,1 : 0,05
10 - x = 2,9
x = 10 - 2,9
x = 7,1
Bài 2:
$\frac{13}{50}$ + 9% + $\frac{41}{100}$ + 0,24
= $\frac{13}{50}$ + $\frac{9}{100}$ + $\frac{41}{100}$ + $\frac{6}{25}$
= $\frac{13}{50}$ + $\frac{9 + 41}{100}$ + $\frac{6}{25}$
= $\frac{13}{50}$ + $\frac{50}{100}$ + $\frac{6}{25}$
= $\frac{13}{50}$ + $\frac{25}{50}$ + $\frac{6}{25}$
= $\frac{13 + 25}{50}$ + $\frac{6}{25}$
= $\frac{38}{50}$ + $\frac{6}{25}$
= $\frac{19}{25}$ + $\frac{6}{25}$
= $\frac{19 + 6}{25}$
= $\frac{25}{25}$
= 1
Cho mk câu trl hay nhất nhé.
