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a,504:[16-3.x]=72
16-3.x=504:72
16-3.x=7
3.x =16-7
3.x =9
\(\Rightarrow x=3\)
b,272-[4.x+15] = 45
4.x+15 = 272-45
4.x+15 = 227
4.x = 227-15
4.x = 212
x = 212:4
\(\Rightarrow x=53\)
c,425-x:8 =91
x:8 =425-91
x:8 =334
x =334x8
\(\Rightarrow x=2672\)
d, 293-8.27+x.25=80
293-216 +x.25=80
77+x.25 =80
x.25 =3
\(\Rightarrow x=\frac{3}{25}\)
x = 3
x = 53
x = 2672
x = 3 / 25
ai thấy đúng thì ủng hộ mk nha
a,\(\frac{37.13-13}{24+37.12}=\frac{36.13}{39.12}=1\)
b,125.7.16.25.4=(125.16).(25.4).7=2000.100.7=1400000
c,8.9.14+6.17.12+19.4.18=2^3.3^2.2.7+2.3.17.2^2.3+19.2^2.3^2.2=2^3.3^2.(2.7+17+19)=72.50=3600
131 . x - 942 = 2^7 . 2^3
131 . x - 942 = 2^10
131 . x - 942 = 1024
131 . x = 1024 + 942
131 . x = 1966
x = 1966 : 131
x \(\approx15\)
b ) [ ( x + 32 ) - 17 ] . 2 = 42
[ ( x + 32 ) - 17 ] = 42 : 2
( x + 32 ) - 17 = 21
x + 32 = 21 + 17
x + 32 = 38
x = 38 - 32
x = 6
a. 100 - 7 ( x - 5 ) = 58
<=> 7 ( x - 5 ) = 100 - 58
<=> 7 ( x - 5 ) = 42
<=> x - 5 = 42 : 7
<=> x - 5 = 6
<=> x = 6 + 5
<=> x = 11
Tương tự tiếp.
a;100-7(x-5)=58
=>7(x-5)=100-58=42
=>x-5=42:7=6
=>x=6+5=11
b;12(x-1):3=72
=>12(x-1)=72.3=216
=>x-1=216:12=18
=>x=18+1=19
c;12-4(x-1)=4
=>4(x-1)=12-4=8
=>x-1=8:4=2
=>x=2+1=3
d;32-12x=8
=>12x=32-8=24
=>x=24:12=2
nho h do nhe viet moi tay lam day biet ko
1) \(x-36:18=12\)
\(\Leftrightarrow x-2=12\)
\(\Rightarrow x=14\)
2) \(x-38:12=12\)
\(\Leftrightarrow x-\frac{19}{6}=12\)
\(\Rightarrow x=\frac{91}{6}\)
3) \(\left(25+x\right)-20:4=35\)
\(\Leftrightarrow25+x-5=35\)
\(\Leftrightarrow x=15\)
4) \(720:\left[41-\left(2x-5\right)\right]+8=48\)
\(\Leftrightarrow41-2x+5=18\)
\(\Leftrightarrow2x=28\)
\(\Rightarrow x=14\)
5) \(5x-x+15=223\)
\(\Leftrightarrow4x=208\)
\(\Rightarrow x=52\)
6) \(7x-55=2x\)
\(\Leftrightarrow5x=55\)
\(\Rightarrow x=11\)
7) \(\left(x-10\right).11=0\)
\(\Leftrightarrow x-10=0\)
\(\Rightarrow x=10\)
a) 80 - (4.52 - 3.23 )
= 80 - ( 4 . 25 - 3. 8 )
= 80 - ( 100 - 24 )
= 80 - 76 = 4
b) 56 : 54 + 23 . 22 - 12017
= 52 + 25 - 1
= 25 + 32 - 1
= 57 -1 = 56
a) \(\left(17x-25\right):8+65=9^2\)
\(\left(17x-25\right).\frac{1}{8}+65=81\)
\(\frac{17}{8}x-\frac{25}{8}=81-65\)
\(\frac{17}{8}x-\frac{25}{8}=16\)
\(\frac{17}{8}x=16+\frac{25}{8}\)
\(\frac{17}{8}x=\frac{128}{8}+\frac{25}{8}\)
\(\frac{17}{8}x=\frac{153}{8}\)
\(x=\frac{153}{8}:\frac{17}{8}\)
\(x=\frac{153}{8}.\frac{8}{17}\)
\(x=\frac{153}{17}\)
\(x=9\)
vay \(x=9\)
b) \(80-\left(4.5^2-3.2^3\right)=2^{10}-\left(x-4\right)\)
\(80-\left(100-24\right)=1024-x+4\)
\(80-76=1028-x\)
\(x=1028-80+76\)
\(x=1024\)
vay \(x=1024\)
người ta biết thừa rùi đấy . Tk mk đi