38.78-(214-1).(214+1)
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214*6+3*214+214*2-214
=214*(6+3+2-1)
=214*10
=2140
~HT~ (Kick cho mik nha!!!)
214 x 6 + 3 x 214 + 214 x 2 - 214
214 x ( 6 + 3 + 2 - 1 )
214 x 10
2140
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(-37).214 + 214.(-63)
= 214. [(-37) + (-63)]
= 214. (-100)
= -21400
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214+[120-(214+120)]
=214+[120-214-120]
=214+120-214-120
=(214-214)+(120-120)
=0+0
=0
214+¨[120-(214+120)]
=214+120-(214+120)
=214+120-214-120
=(214-214)+(120-120)
=0+0
=0
mk nhanh nhất lun
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b)(1-3-5+7)+(9-11-13+15)+...+(2009-2011-2013+2015)
=0+0+...+0
=0
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\(\left(x+1\right)+\left(x+2\right)+...+\left(x+214\right)=23632\)
\(\Rightarrow\left(x+x+.....+x\right)+\left(1+2+....+214\right)=23632\)
\(\Rightarrow214x+23005=23632\)
\(\Rightarrow214x=627\)
\(\Rightarrow x=\frac{627}{214}\)
\(3^8\cdot7^8-21^8+1=21^8-21^8+1=1\)