Question

[Kiệt Trương]

4 / 7 x X + 3 / 7 - 0,75 x  X = 1,25

Answer 1

[çá﹏๖ۣۜhⒺo╰‿╯²ᵏ⁹]

Thay X \(=1,25\) vào biểu thức \(\dfrac{4}{7}\) x \(X+\dfrac{3}{7}-0,75\) x X ta có:

 \(\dfrac{4}{7}\) x \(1,25+\dfrac{3}{7}-0,75\) x \(1,25\)

\(=\dfrac{5}{7}+\dfrac{3}{7}-\dfrac{15}{16}\)

\(=\dfrac{80}{112}+\dfrac{48}{112}-\dfrac{105}{112}\)

\(=\dfrac{80+48-105}{112}=\dfrac{23}{112}\)

Vậy X\(=1,25\) giá trị biểu thức  \(\dfrac{4}{7}\) x \(X+\dfrac{3}{7}-0,75\) x X là: \(\dfrac{23}{112}\)