Question

[Đoàn Thị Minh Phượng]

a= 15 x 23,45 + 860 x 2,345- 2345

Answer 1

[๖ۣۜWin๖ۣۜZy (ツтєαм♕¢âи♕6 ᴾᴿᴼシ)]

a= 15 x 23,45 + 86 x 10 x 2,345 - 2345

 = 15 x 23,45 + 86 x 23,45 - 2345

 = 23,45 x (15+86) - 2345

 = 23,45 x 101 - 23,45 x 100

 = 23,45 x (101-100) = 23,45 x1=23,45

Answer 2

[Võ Ngọc Phương]

\(a=15\times23,45+860\times2,345-2345\)

\(a=15\times23,45+86\times10\times2,345-2345\)

\(a=15\times23,45+86\times23,45-2345\)

\(a=23,45\times\left(15+86\right)-2345\)

\(a=23,45\times101-2345\)

\(a=2368,45-2345\)

\(a=23,45\)

Vậy...