ai nhanh tớ tích cho
\(1+3+5+...+\left(2x+1\right)=225\)
\(\left[\left(2x+1\right)+1\right].\left\{\left[\left(2x+1\right)-1\right]:2+1\right\}:2=225\)
\(2.\left(x+1\right).\left(x+1\right):2=225\)
\(\left(x+1\right)^2=225\)
\(\left(x+1\right)^2=15\)
\(\Rightarrow x+1=15\)
\(\Rightarrow x=14\)
mới dùng tích ntn
thx rất nhiều
tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
1/3 x 5 + 1/5 x 7 + 1/7 x 9+ ... + 1/(2x + 1) x (2x + 3) = 15/93.tinh x
a,2/5+3/7+-3/5
b,1-5/7:x=-1/3
c,4/5*(x-1/3)=15/8
d,2/3:(2x+1/8)=7/3
e,2x+3/4=10/3-5/4
giúp mình với
Tìm x:
a, -1/3. (15x-9)+ 2/7. (-x-34)= 1- 3/4. (-16x+4)
b, -1/3. (x-5)+ 1/2. (2x-1/3) = -4.(x+1/2) -7
c, 3.(-2x+7) -6. (1/2x) =1.(x-3)
tìm x biết1\3*5+1\5*7+1\7*9+....+1\(2x+1)(2x+3)
Tìm x x/7=5/3; x+1/6 = x-1/7; 5-3x/4+2x =-1/3
1,-15(x+2)+7(2x-3)
2,x^2+2x=0
3,(-2x)(-4x)+28=100
4,(2x-5)^2-49=0
5,/x-5/+/y-3/=1
6,3×(x-2)-6(x-5)=2(5-2x)
7, 5x ×(-x)^2+1=0
8,4x^3=4x
1. | 4-2x | . 1/3 = 1/3
2. (-3)² : | x+(-1) | = (-3)
3. | 3/2 -x | + (-4/5) = -14/5
4. (-4/3) - | 2x + (-1) | = -7/3
5. -9 . | 36 - x/2 | = (-54)
6. 0,75 - | (-x) + 1/3 | = 0,25
7. (-6/5) + | x-9 |= (-6/5)
8. (-4) . | 3x - 1/5 | = 12
Tìm x biet:
a,5/2x+x=32/15
b,x-7/2x=-32/15
c,-7/3x-7/4x+11/3=18/5
d,-5/6-3x=2/3
e,2x-5/9=-2/3
f,1/2-2/3x=7/12
g,7-|2x-3|=4
h,(19x+2.5^2):14=(13-8)^2-4^2
i,3/4x-2/3=2/7.1/6+5/7.1/6
k,(x+1/2).(2/3-2x)=0
l,x/2013-1/10-1/15-1/21-........-1/120=5/8