Question

[x*5-19]+[x*9+24]=12

hỏi x là số nào

Answer 1

[ x * 5 - 19 ] + [ x * 9 + 24 ] = 12

( x * 5 + x * 9 ) -  19 + 24    = 12

x * ( 5 + 9 ) + 5                   = 12

x * 14                                 = 7

x                                         = 0,5
 

Answer 2

\(\left[x\times5-19\right]+\left[x\times9+24\right]=12\)

\(\left(x\times5+x\times9\right)-19+24=12\)

\(x\times\left(5+9\right)+5=12\)

\(x\times14=7\)

\(x=0,5\)