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Wie ist der rechenweg von 4x+81=-70+x+100

 06.08.2015

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 #1
avatar+14538 
+3

4x+81=-70+x+100     | -x

3x +81 = 30                |  -81

3x  =  -51                    |  : 3

  x  =  - 17

 

Probe:  $${\mathtt{4}}{\mathtt{\,\times\,}}\left(-{\mathtt{17}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{81}} = {\mathtt{13}}$$            $${\mathtt{\,-\,}}{\mathtt{70}}{\mathtt{\,-\,}}\left({\mathtt{17}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{100}} = {\mathtt{13}}$$

 

Gruß radix !

 06.08.2015
 #1
avatar+14538 
+3
Beste Antwort

4x+81=-70+x+100     | -x

3x +81 = 30                |  -81

3x  =  -51                    |  : 3

  x  =  - 17

 

Probe:  $${\mathtt{4}}{\mathtt{\,\times\,}}\left(-{\mathtt{17}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{81}} = {\mathtt{13}}$$            $${\mathtt{\,-\,}}{\mathtt{70}}{\mathtt{\,-\,}}\left({\mathtt{17}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{100}} = {\mathtt{13}}$$

 

Gruß radix !

radix 06.08.2015

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