Toán đại số 7

S

sonsuboy

$(2x-1-2-3-...-10-x)(2003. 1)=0$
\Rightarrow $(2x-1-2-3-...-10-x)=0$
\Rightarrow $2x-x-(1+2+3+....+10)=0$
\Rightarrow$x=55$
 
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