x+2+x+4+x+6+x+8=1200
x+(2+4+6+8)=1200
x+20=1200
x=1200-20
x=1180
cho minh nhe!
\(x+2+x+4+x+6+x+8=1200\)
\(4x+20=1200\)
\(4x=1200-20\)
\(4x=1180\)
\(x=1180:4\)
\(x=295\)
x + 2 + x + 4 + x + 6 + x + 8 = 1200
x + ( 2 + 4 + 6 + 8 ) = 1200
x + 20 = 1200
x = 1200 - 20
x = 1180
4 lần x là:1200-8-6-4-2=1180
x là:1180:4=295
x=295
[x *4]+[2+4+6+8]=1200
[x*4]+20=1200
x*4=1200-20
x*4=1180
x=1180:4
x=295
\(x+2+x+4+x+6+x+8=1200\)
\(x\times4+20=1200\)
\(x\times4=1200-20\)
\(x\times4=1180\)
\(x=1180:4\)
\(x=295\)