Question

tìm x biết

a,315+(125-x)=435

b,x:(111-99)=175

c,(509+355):x=840:35

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Answer 1

a,315+(125-x)=435

125-x=435-315

125-x=120

x=125-120

x=5

Answer 2

b,x:(111-99)=175

x:12=175

x=175.12

x=2100

Answer 3

a;315+(125-x)=435

           125-x=435-315

            125-x=120

                  x=125-120

                  x=5

b;x/(111-99)=175

x/12=175

x    =175*12

Answer 4

c,(509+355):x=840:35

864:x=24

x=864:24

x=36

Answer 5

\(a,315+\left(125-x\right)=435\)

\(\Rightarrow125-x=435-315\)

\(\Rightarrow125-x=120\)

\(\Rightarrow x=125-120\)

\(\Rightarrow x=5\)

\(b,x:\left(111-99\right)=175\)

\(\Rightarrow x:12=175\)

\(\Rightarrow x=175\times12\)

\(\Rightarrow x=2100\)

\(c,\left(509+355\right):x=840:35\)

\(\Rightarrow864:x=24\)

\(\Rightarrow x=864:24\)

\(\Rightarrow x=36\)

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