Question

130-[5.(9-x)+43]=47

Answer 1

130-[5.(9-x)+43]=47

5.(9-x)+43=130-47

5.(9-x)+43=83

5.(9-x)=83-43

5.(9-x)=40

9-x=40:5

9-x=8

x=9-8

x=1

Answer 2

\(130-\left[5\times\left(9-x\right)+43\right]=47\)

\(\Rightarrow\left[5\times\left(9-x\right)+43\right]=130-47\)

\(\Rightarrow\left[5\times\left(9-x\right)\right]=83\)

\(\Rightarrow\left(9-x\right)=83\div5\)

\(\Rightarrow\left(9-x\right)=\frac{83}{5}\)

\(\Rightarrow x=9-\frac{83}{5}\)

\(\Rightarrow x=-\frac{38}{5}\)

Answer 3

Mình nhầm :

\(130-\left[5\times\left(9-x\right)+43\right]=47\)

\(\Rightarrow\left[5\times\left(9-x\right)+43\right]=130-47\)

\(\Rightarrow\left[5\times\left(9-x\right)+43\right]=83\)

\(\Rightarrow5\times\left(9-x\right)=83-43\)

\(\Rightarrow5\times\left(9-x\right)=40\)

\(\Rightarrow\left(9-x\right)=40\div5\)

\(\Rightarrow\left(9-x\right)=8\)

\(\Rightarrow x=9-8\)

\(\Rightarrow x=1\)