Toán Lớp 7: Toán X+9/2000 + x+8/2001=×+5/2004 + x+4/2005

Question

Toán Lớp 7:  Toán  X+9/2000 + x+8/2001=×+5/2004 + x+4/2005

hiennhi98 · Answer

Giải đáp+Lời giải và giải thích chi tiết:   (x+9)/2000+(x+8)/2001=(x+5)/2004+(x+4)/2005    to (x+9)/2000+1+(x+8)/2001+1=(x+5)/2004+1+(x+4)/2005+1    to (x+9+2000)/2000+(x+8+2001)/2001=(x+5+2004)/2004+(x+4+2005)/2005    to (x+2009)/2000+(x+2009)/2001=(x+2009)/2004+(x+2009)/2005    to (x+2009)/2000+(x+2009)/2001-(x+2009)/2004-(x+2009)/2005=0    to (x+2009)(1/2000+1/2001-1/2004-1/2005)=0    to x+2009=0 (v&igrave; 1/2000+1/2001-1/2004-1/2005 ne0)    to x=-2009   Vậy x=-2009

cobelolen · Answer

qquad (x+9)/2000+(x+8)/2001=(x+5)/2004+(x+4)/2005 <=> ((x+9)/2000+1)+((x+8)/2001+1)=((x+5)/2004+1)+((x+4)/2005+1) <=> (x+2009)/2000+(x+2009)/2001=(x+2009)/2004+(x+2009)/2005 <=> (x+2009)(1/2000+1/2001-1/2004-1/2005)=0 Do 1/2000+1/2001-1/2004-1/2005 ne0 => x+2009=0 <=> x=-2009 Vậy x=-2009