Toán Lớp 8: 3x/x+1 +x+4/x+1
x+2/x+3 +-5/(x+3).(x-2)
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Toán Lớp 8: 3x/x+1 +x+4/x+1
x+2/x+3 +-5/(x+3).(x-2)
Comments ( 2 )
(3x)/(x+1) +(x+4)/(x+1)(x\ne-1)
=(3x+x+4)/(x+1)
=(4x+4)/(x+1)
=(4(x+1))/(x+1)
=4
(x+2)/(x+3)+(-5)/((x+3)(x-2))(x\ne-3;x\ne2)
=((x+2)(x-2))/((x+3)(x-2))+(-5)/((x+3)(x-2))
=((x+2)(x-2)-5)/((x+3)(x-2))
=(x^2-4-5)/((x+3)(x-2))
=(x^2-9)/((x+3)(x-2))
=((x+3)(x-3))/((x+3)(x-2))
=(x-3)/(x-2)
(3x)/(x+1) + (x+4)/(x+1)
=(3x+x+4)/(x+1)
=(4x+4)/(x+1)
=(4(x+1))/(x+1)
=4
(x+2)/(x+3) +(-5)/((x+3).(x-2))
=((x+2)(x-2)-5)/((x+3)(x-2))
=(x^2-4-5)/((x+3)(x-2))
=(x^2-9)/((x+3)(x-2))
=((x-3)(x+3))/((x+3)(x-2))
=(x-3)/(x-2)