tìm X
X x 35+161=1736
12680 / x-296=21
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34+(21-x)=(3747-30)-3746
34+(21-x)=3717-3746
34+(21-x)=-29
21-x=-29-34
21-x=-63
x=21-(-63)
x=21+63
x=84
(x+153)-(48-193)=1-2-3-4
(x+153)-(48-193)=-8
(x+153)-(-145)=-8
(x+153)+145=-8
x+153=-8-145
x+153=-153
x=-153-153
x=0
35-(x+5)=315-(2x+135)
213-(x+84)= -161
x+84=213-(-161)
x+84=213+161
x+84=374
x=374-84
x=290
a, 72 :x = 35 -27
72 : x = 8
x =72 : 8
x = 9
b, x : 8 + 113 =161
x : 8 = 161 - 113
x : 8 = 48
x = 48 x 8
x = 304
tik mk nha nguyễn thúy kiều xinh đẹp
\(\dfrac{x-241}{17}+\dfrac{x-220}{19}+\dfrac{x-195}{21}+\dfrac{x-161}{23}=10\)
<=>\(\dfrac{x-241}{17}-1+\dfrac{x-220}{19}-2+\dfrac{x-195}{21}-3\dfrac{x-161}{23}-4=0\)
<=>\(\dfrac{x-258}{17}+\dfrac{x-258}{19}+\dfrac{x-158}{21}+\dfrac{x-158}{23}=0\)
<=>\(\left(x-258\right)\left(\dfrac{1}{17}+\dfrac{1}{19}+\dfrac{1}{21}+\dfrac{1}{23}\right)=0\)
vì 1/17+1/19+1/21+1/23 khcas 0
=>x-258=0<=>x=258
vậy...............
chcus bạn học tốt ^^
-(1/3)-1/15-1/35-...-1/x.(x+2)=20/-21
=>1/3+1/15+1/35+...+1/x(x+2)=20/21
=>1/2 * (2/3 + 2/15 + 2/35 + ... + 2/x(x+2) )=20/21
=>\(\dfrac{2}{1\cdot3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{x\left(x+2\right)}=\dfrac{20}{21}:\dfrac{1}{2}\)
=>\(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{x}-\dfrac{1}{x+2}=\dfrac{40}{41}\)
=>\(1-\dfrac{1}{x+2}=\dfrac{40}{41}\)
=>\(\dfrac{1}{x+2}=1-\dfrac{40}{41}=\dfrac{1}{41}\)
=>x+2=41=>x=39
(1/3)-1/15-1/35-...-1/x.(x+2)=20/-21
=>1/3+1/15+1/35+...+1/x(x+2)=20/21
=>1/2 * (2/3 + 2/15 + 2/35 + ... + 2/x(x+2) )=20/21
=>21⋅3+23.5+25.7+...+2x(x+2)=2021:1221⋅3+23.5+25.7+...+2x(x+2)=2021:12
=>1−13+13−15+15−17+...+1x−1x+2=40411−13+13−15+15−17+...+1x−1x+2=4041
=>1−1x+2=4041
a) 35-15+x=70
=> 20+x=70
=> x=50
b) 568-(2x+14)=15
=> 2x+14=553
=> 2x=539
=> x=269,5
c) x-105:21=15
=> x-5=15
=> x=20
d) (x-105)*21=15
=> x-105=5/7
=> x=5/7+105
=> x=740/7
a, 35 - 15 + x = 70 b, 568 - (2.x + 14 )= 15
x = 70 - 35 + 15 2.x + 14 = 568 - 15
x = 50 2.x + 14 =553 => 2.x =553-14=539 =>x=539 : 2 =269.5
c, x - 105 : 21 =15 d, (x - 105) . 21 = 15
x - 105 = 15 x 21 x - 105 = 15 : 21
x - 105 = 315 x - 105 = \(\frac{5}{7}\)
x = 315+105 x = \(\frac{5}{7}\)+ 105
x = 420 x = \(\frac{740}{7}\)
21-(25-X+23)= -(35-7)
21-25+X-23= -28
(-4)+X-23 = -28
(-4)+X=-28+23
(-4)+X=-5
X=(-5)-(-4)
X= -1
a,21-(25-X+23)=-(35-7)\(\Rightarrow21-\left(48-\chi\right)=-28\)
\(\Rightarrow48-\chi=21+28\)
\(\Rightarrow48-\chi=49\Rightarrow\chi=-1\)
HTDT
X x 35+161=1736
X x 35 =1736-161
X x 35 =1575
X =1575:35
X =45
Vậy X =45
12680 : X-296=21
12680:X =21+296
12680: X =317
X =12860:317
X =40
Vậy X =40