mn giups milk zới
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Answer
Is there any milk in the can ?
No,there isn't any milk in the can.
#quankun^^
Vì 1/x(x+1) = 1/x - 1/(x+1) nên
vế trái = 2(1/2.3 + 1/3.4 + ... + 1/x(x+1))
=2( 1/2 - 1/3 + 1/3 - 1/4 +...+ 1/x - 1/(x+1)
=2( 1/2 - 1/(x+1)
= x/(x+1)
Đến đây thì bạn tự thay vào rồi giải tiếp
nha
bn tham khảo!:
B(13)={0,13,26,39,52,65,78...}
Vì 21 < x < 65 => x = 26,39,52,65.
cr: gg
hc tốt
có : B( 12) = { 0; 12;24;36;48; 60;72;84;96;108;....}
Mà 12 \(\le x\le100\) => x \(\in\left\{12;24;36;...;96\right\}\)
*Sxl
1" =>-4y-y=-5-13
=>-5y=-18
=>y=18/5
2: =>2x+x=2/3+3/5
=>3x=19/15
=>x=19/45
3: =>17-14x-14=13-5x+15
=>-14x+3=-5x+28
=>-9x=25
=>x=-25/9
4: =>3(3x-7)+2(x+1)=-96
=>9x-21+2x+2=-96
=>11x=-96+19=-77
=>x=-7
5: =>15x-5x-5=6x+3
=>10x-5=6x+3
=>4x=8
=>x=2
\(a+a.\frac{3}{2}+a:\frac{2}{7}=252\)
=>\(a+a.\frac{3}{2}+a.\frac{7}{2}=252\)
=>\(a.\left(1+\frac{3}{2}+\frac{7}{2}\right)=252\)
=>\(a.\left(1+5\right)=252\)
=>\(a.6=252\)
=>\(a=42\)
Vậy \(a=42\)
A+Ax3/2+A:2/7=252
A+Ax3/2+Ax7/2=252
Ax(1+3/2+7/2)=252
Ax6=252
A=42
HT
1. The cake was put on the red table yesterday.
2. This hat was made for his girlfriend last Monday.
3. A lot of friends were had in Ho Chi Minh City 3 years ago.
4. He was taken to see Tri Nguyen aquarium by his uncle last week.
C tick cho e vs nhek! (E lớp 6 ak; vì cái này e hc ở Trung tâm rồi nên e giúp c nhek ak)