Question

Tìm x

 ( 2x + 5 ) . | -7 | = 73

Answer 1

(2x+5) . l-7l = 73

=(2x+5) . 7 =73

=(2x+5)     =\(\frac{73}{7}\) 

=2x          =\(\frac{73}{7}\) - 5

=2x          =\(\frac{38}{7}\) 

=x           =\(\frac{38}{7}\) :2

=x           =\(\frac{19}{7}\)

Answer 2

(2x+5).|-7|=73

=> (2x+5).7=73

=> 2x+5=73:7

=> 2x+5=\(\frac{73}{7}\)

=>2x=\(\frac{73}{7}\)-5

=>2x=\(\frac{38}{7}\)

=>x=\(\frac{38}{7}\):2

=>x=\(\frac{19}{7}\)

vậy.....

Answer 3

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