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35.(24−6.x)=0
24-6x= 0:35
24-6x=0
6x=24-0
6x=24
x=24:6=4
3.(x+7)−15=27
3(x+7)=27+15
3(x+7)=42
x+7=42:3
x+7=14
x=14-7=7
TK MIK NHA~~
a, (17x-25):8=81-65
(17x-25):8=16
17x-25=16:8
17x-25=2
17x=2+25
17x=27
x=27:17
x=27/17
b,720:[41-(2x-5)]=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=23+5
2x=28
x=28:2
x=14
c,231-(x-6)=103
x-6=231-103
x-6=128
x=128+6
x=134
XEM LẠI GIÙM MÌNH BẠN NHA!
đề bài: (17x-25):8+65= 81
(17x-25):8=81-65=16
17x-25= 16 . 8= 128
17x = 128+25=153
x = 153:17=9
b, Đề bài 720:[41-(2x-5)]=8.5
720:[41-(2x-5)]=40
41-(2x-5)=720:40=18
2x-5=41-18=23
2x = 23+5=28
x = 28:2= 14
c, 231-(x-6)=1339:13=103
x-6=231-103=128
x= 128 + 6= 134
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\(5\frac{3}{4}\times x=8\frac{2}{5}\)
\(\frac{23}{4}\times x=\frac{42}{5}\)
\(x=\frac{42}{5}\div\frac{23}{4}\)
\(x=\frac{168}{115}\)
\(5\frac{3}{4}.x=8\frac{2}{5}\)
\(\frac{23}{4}.x=\frac{42}{5}\)
\(x=\frac{42}{5}:\frac{23}{4}\)
\(x=\frac{168}{115}\)
vậy \(x=\frac{168}{115}\)
a = 2,45 x ( 46 + 54 ) + 8 x (0,5 + 0,75 )
= 2,45 x 100 + 8 x 1,25
= 245 + 10
= 255
a,3x-3+6x-12=5
9x-15=5
9x=20
x=20/9
b,3x-6+6x-6=6
9x-12=6
9x=18
x=2
c,4x+4+5x+10=3x+20
9x+14=3x+20
9x-3x=6
6x=6
x=1
a) 3.(x-1) + 6.(x-2) = 5
3.x - 3 + 6.x - 12 = 5
9.x - 15 = 5
9.x = 5 + 15
9.x = 20
x = \(\frac{20}{9}\)
Vậy x = \(\frac{20}{9}\)
b) 3.(x-2) + 6.(x-1) = 6
3.x - 6 + 6.x - 6 = 6
9.x - 12 = 6
9.x = 6 + 12
9.x = 18
x = 18 : 9
x = 2
Vậy x = 2
c) 4.(x+1) + 5.(x+2) = 3.x +20
4.x +4 +5.x +10 = 3.x +20
9.x + 14 = 3.x +20
9.x - 3.x = 20 - 14
6.x = 6
x = 6 : 6
x = 1
Vậy x = 1
\(\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+.......+\dfrac{1}{x\cdot\left(x+1\right)}=\dfrac{122}{123}\)
\(\Leftrightarrow1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+......+\dfrac{1}{x}-\dfrac{1}{x+1}=\dfrac{122}{123}\)
\(\Leftrightarrow1-\dfrac{1}{x+1}=\dfrac{122}{123}\)
\(\Leftrightarrow\dfrac{1}{x+1}=\dfrac{1}{123}\)
\(\Leftrightarrow x=122\)
\(0,5.x+x:4.6+x:2.4=8\)
\(\Leftrightarrow0,5.x+x.0,25.6+x.0,5.4=8\)
\(\Leftrightarrow x\left(0,5+1,5+2\right)=8\)
\(\Leftrightarrow x.4=8\)
\(\Leftrightarrow x=2\)
Vậy x = 2
0,5 . x + x : 4 . 6 + x : 2 . 4
0,5 . x + x . 0,25 . 6 + x . 0,5 x 4 = 8
0,5.x + x.1,5 + x.2 = 8
x. ( 0,5 + 1,5 + 2 ) = 8
x . 4 = 8
=> x = 2