1\2x1/4x1/6=
1/2x1/4;1/6=
1/2;1/4x1/6=
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Tính
a ) 1/2 x 1/4 x 1/6
= 1/8 x 1/6
= 1/48
b ) 1/2 x 1/4 : 1/6
= 1/8:1/6
3/4
c ) 1/2 : 1/4 x 1/6
= 2 x 1/6
= 1/3
tk mk nha ( nếu đúng )
hihi mơn nha !!!!!!!!!
1/2x1/3+1/3-1/4+1/4x1/5
= 1/2-1/3+1/3-1/4+1/4-1/5
=1/2-1/5
=3/10. (1/2x1/3= 1/2x3)
1/2x1/3+1/3-1/4+1/4x1/5 = 1/2-1/3+1/3-1/4+1/4-1/5 =1/2-1/5 =3/10. (1/2x1/3= 1/2x3)
1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7+1/7x1/8+1/8x1/9
=7/18
(1-1/2x1/2)x(1-1/3x1/3)x(1-1/4x1/4)x…x(1-1/2007x1/2007) = ( 1 - 1/4 ) x ( 1 - 1/9 ) x ( 1- 1/16) x .....x ( 1 - 1/4028049) = 3/4 x 8/9 x 15/16 x .....x 4028048 / 4028049 = 3 x 8 x 15 x .....x 4028048 / 4 x 9 x 16 x ......x 4028049 = 1 x 3 x 2 x 4 x 3 x 5 x .....x 2006 x 2008 / 2x2 x 3 x3 x 4 x 4 x .....x 2007 x 2007 = ( 1 x 2 x 3 x .....x 2006) x ( 3 x 4 x 5 x .....x 2008) / ( 2 x 3 x 4 x ....x 2007) x ( 2 x 3 x 4 x ....x 2007) = 2008 / 2007 x 2 = 1004 / 2007
(1-1/2x1/2)x(1-1/3x1/3)x(1-1/4x1/4)x…x(1-1/2007x1/2007)
= ( 1 - 1/4 ) x ( 1 - 1/9 ) x ( 1- 1/16) x .....x ( 1 - 1/4028049)
= 3/4 x 8/9 x 15/16 x .....x 4028048 / 4028049
= 3 x 8 x 15 x .....x 4028048 / 4 x 9 x 16 x ......x 4028049
= 1 x 3 x 2 x 4 x 3 x 5 x .....x 2006 x 2008 / 2x2 x 3 x3 x 4 x 4 x .....x 2007 x 2007
= ( 1 x 2 x 3 x .....x 2006) x ( 3 x 4 x 5 x .....x 2008) / ( 2 x 3 x 4 x ....x 2007) x ( 2 x 3 x 4 x ....x 2007)
= 2008 / 2007 x 2
= 1004 / 2007
Δ=(2m-1)^2-4*2*(m-1)
=4m^2-4m+1-8m+8
=4m^2-12m+9=(2m-3)^2>=0
=>PT luôn có 2 nghiệm
4x1^2+4x2^2+2x1x2=0
=>4[(x1+x2)^2-2x1x2]+m-1=0
=>4[(-2m+1)^2/4-2*(m-1)/2]+m-1=0
=>(2m-1)^2-4(m-1)+m-1=0
=>4m^2-4m+1-3m+3=0
=>4m^2-7m+4=0
=>\(m\in\varnothing\)
48
k nha
48 nha bn