\(\text{Ta có: a,(x+1)+(x+3)+(x+5)+...+(x+99)=0 }\)
\(\Leftrightarrow50x+\left(1+3+5+...+99\right)=0\)
\(\Leftrightarrow50x+2500=0\)
\(\Rightarrow50x=-2500\)
\(\Rightarrow x=-2500:50=-50\)
a,(x+1)+(x+3)+(x+5)+...+(x+99)=0
b,(x-3)+(x-2)+(x-1)+...+10+11=11
ai nhanh tick cho
Tính nhanh :
a) 1 / 1 x 2 + 1/ 2 x 3 + 1/ 3 x 4 + .............................................................................................................. + 1 / 99 x100
b) 2 / 1 x 3 + 2 / 3 x 5 + 2 / 5 x 7 + ............................................................................................................ + 2 / 97 x 99
c) 4 / 5 x 7 + 4 / 7 x 9 + 4 / 9 x 11 + .......................................................................................................... + 4 / 59 x 61
Giúp mình nha mình tick cho.
a/ (x+1)+(x+3)+(x+5)+....+(x+99)=0
b/ (x-3)+(x-2)+(x-1)+...+10+11=11
Tìm x?
tìm x,y
(15-x)+(x-12)=(-5+x)
(x+1)+(x+3)+(x+5)+...+(x+99)=0
(x-3)+(x-2)+(x-1)+....+10+11=11
(x-3).(2y+1)=7
|x-8|+|y+2|=2
3x+4y-xy=15
x+(x+1)+(x+2)+...+2003=600
(-1)+3+(-5)+7+.....+x=600
2+(-4)+6+(-8)+.......+(-x)=-2000
giải nhanh giúp mk nha
ai nhanh, đúng mk tc cho nhìu
tìm x
a)(x+1)+(x+3)+(x+5)+...+(x+99)=0
b)(x-3)+(x-2)+(x-1)+...+10+11=11
(x+3)^x+11= (x+3)^7
(x-3)+(x-2)+(x-1)+........+10+11=11
tìm x
làm nhanh tớ tick cho
1.tìm x,y biết
a, x.(y-3)≥0
b, (2.x-1).(y-1)≤0
c,(x-1).(2.k+1)≥0
2. tìm x,y ϵ Z biết
a, x(x+3)=0
b,(x-2).(5-x)=0
c,(x-1).(x^2+1)=0
d, x.y+3.x-7.y=21
e,x.y+3.x-2y=11
Tìm x thuộc Z:
a)(x+1)+(x+3)+(x+5)+.....+(x+99)=0
b)(x-3)+(x-2)+(x-1)+.....+10+11=11
tính A=1 x 2 x 3 x 4 + 5 x 6 +...+ 99 x 100
giúp mình nhanh nhé mình tick cho
