tìm x
194 - 24 : (12 : 3 x x -3) -25 = 145
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194 - 24 : ( 12 : 3 . x - 3 ) - 25 = 145
194 - 24 : ( 4 . x - 3 ) - 25 = 145
194 - 24 : ( 4 . x - 3 ) = 145 + 25
194 - 24 : ( 4 . x - 3 ) = 170
24 : ( 4 . x - 3 ) = 194 - 170
24 : ( 4 . x - 3 ) = 24
4 . x - 3 = 24 : 24
4 . x - 3 = 1
4 . x = 1 + 3
4 . x = 4
x = 4 : 4
x = 1
- Hok t -
194 - 24 : ( 12 : 3 . x - 3 ) - 25 = 145
194 - 24 : ( 12 : 3 . x - 3) = 145 + 25
194 - 24 : ( 12 : 3 . x - 3 ) = 170
24 : ( 12 : 3 . x - 3 ) = 194 - 170
24 : ( 12 : 3 . x - 3 ) = 24
12 : 3 . x - 3 = 24 : 24
12 : 3 . x - 3 = 1
12 : 3 . x = 1 + 3
12 : 3 . x = 4
3 . x = 12 : 4
3 . x = 3
x = 3 : 3
x = 1
-HT-
a, (-25) + 276 - (276 - 25)
= (-25) + 276 - 276 + 25
= [ (-25) + 25] - (276 - 276)
= 0 - 0
= 0
b, 24 x 46 + 24 x 53 + 24
= 24 x ( 46 + 53 + 1)
= 24 x 100
= 2400
B)
194−24:(12:3×x−3)−25=145
⇔194−24:(4×x−3)=145+25
⇔194−24:(4×x−3)=170
⇔24:(4×x−3)=194−170
⇔24:(4×x−3)=24
⇔4×x−3=24:24
⇔4×x−3=1
⇔4×x=1+3
⇔4×x=4
⇔x=4:4
⇔x=1
Vậyx=1
Trả lời:
\(194-24\div\left(44x-3\right)-25=145\)
\(\Leftrightarrow194-24\div\left(44x-3\right)=170\)
\(\Leftrightarrow24\div\left(44x-3\right)=24\)
\(\Leftrightarrow44x-3=1\)
\(\Leftrightarrow44x=4\)
\(\Leftrightarrow x=\frac{1}{11}\)
Vậy \(x=\frac{1}{11}\)
\(x\times\frac{1}{3}\div\frac{2}{9}-x\div5=1\frac{2}{5}\)
\(\Leftrightarrow x\times\frac{1}{3}\times\frac{9}{2}-x\times\frac{1}{5}=\frac{7}{5}\)
\(\Leftrightarrow x\times\frac{3}{2}-x\times\frac{1}{5}=\frac{7}{5}\)
\(\Leftrightarrow x\times\left(\frac{3}{2}-\frac{1}{5}\right)=\frac{7}{5}\)
\(\Leftrightarrow x\times\frac{13}{10}=\frac{7}{5}\)
\(\Leftrightarrow x=\frac{14}{13}\)
Vậy \(x=\frac{14}{13}\)
\(\left(x.7-7\right)\left(x.12+24\right)=0\)
=> \(\orbr{\begin{cases}x.7-7=0\\x.12+24=0\end{cases}}\)
=> \(\orbr{\begin{cases}7x=7\\12x=-24\end{cases}}\)
=> \(\orbr{\begin{cases}x=1\\x=-2\end{cases}}\)
\(170-\left(4+5x\right)=101\)
=> \(4+5x=170-101\)
=> \(4+5x=69\)
=> \(5x=69-4\)
=> \(5x=65\)
=> \(x=65:5=13\)
(x.7-7).(x.12+24)=0
* x.7-7=0 * x.12+24=0
x.7=7 x.12=24
x=7:7 x=24:12
x=1 x=2
vạy x=1 hoặc x=2
170-(4+5x)=101
4+5x=170-101
4+5x=69
5x=69-4
5x=65
x=65:5
x=13
vậy x=13
250:(2x-4)=145-120
250:(2x+4)=25
2x+4=250:25
2x+4=10
2x=10+4
2x=14
x=14:2
x=7
vậy x=7
6.x+3.x-4.x=105
x.(6+3-4)=105
x.(9-4)=105
x.5=105
x=105:5
x=21
vậy x=21
b: =2376-376+3425-42
=2000+3383
=5383
c: =3145-145+246+4246+2347-347
=3000+2000+4492
=9492
e: =(72-72):A=0
1/ -7264 + (1543 + 7264)
=-7264 + 1543 + 7264=1543
2/ (144 – 97) – 144
=144-97-144=-97
3/ (-145) – (18 – 145)(Vì có dấu trừ ở trước ngoặc nên p đổi dấu)
=-145-18+145=-18
4/ 111 + (-11 + 27)
=111-11+27=137
194 - 24 : (12 : 3 x x -3) -25 = 145
194 - 24 : (4 x x -3) -25 = 145
24 : (4 x x -3) = 194 - 145 + 25
24 : (4 x x -3) = 24
4 x x -3 = 24 : 24
4 x x -3 = 1
4 \(\times\)x = 1 + 3
4 \(\times\)x = 4
x = 4 : 4
x = 1
`194 - 24 : (12 : 3 x xx -3) -25 = 145`
`24 : (4 xx x-3) = 194-(145+25)`
`24 : (4 xx x-3) = 24`
`4 xx x -3 = 1`
`4 xx x=1+3`
`4 xx x=4`
`x=4:4`
`x=1`.