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Tham khảo :
\(272+\left(146-x\right)=118\)
\(146-x=118-272\)
\(146-x=-154\)
\(x=146-\left(-154\right)\)
\(\Rightarrow x=300\)
\(504:\left(16-3x\right)=72\)
\(16-3x=504:72\)
\(16-3x=7\)
\(3x=16-7\)
\(3x=9\)
\(x=9:3\)
\(\Rightarrow x=3\)
\(\frac{x}{-4}=\frac{-16}{x}\)
\(\Rightarrow x\cdot x=-16\cdot\left(-4\right)\)
\(\Rightarrow x^2=64\)
\(\Rightarrow x^2=\left(\pm8\right)^2\)
\(\Rightarrow x=\pm8\)
a)\(\left(x-\frac{5}{8}\right).\frac{5}{18}=-\frac{15}{36}\)
\(\Rightarrow x-\frac{5}{8}=\frac{-15}{36}.\frac{18}{5}\)
\(\Rightarrow x-\frac{5}{8}=-\frac{3}{2}\)
\(\Rightarrow x=-\frac{12}{8}+\frac{5}{8}=-\frac{7}{8}\)
b)\(\frac{x}{-4}=\frac{-16}{x}\)
\(\Rightarrow x^2=64\)
\(\Rightarrow x=\orbr{\begin{cases}8\\-8\end{cases}}\)
2:
a: \(2^2\cdot3-4=4\cdot3-4=12-4=8\)
b: \(16-2^3\cdot2=16-2^4=16-16=0\)
c: \(4^2-4\cdot2=16-8=8\)
d: \(3^3-2\cdot3^2=27-2\cdot9=27-18=9\)
e: \(7^2-9\cdot2^2=49-9\cdot4=49-36=13\)
f: \(2^2\cdot3+4^2=4\cdot3+16=12+16=28\)
Bài 1:
a: \(13+21\cdot5-\left(198:11-8\right)\)
\(=13+105-18+8\)
=21+87
=108
b: \(272:16-5+4\cdot\left(30-5-255:17\right)\)
\(=17-5+4\cdot\left(30-5-15\right)\)
\(=12+4\cdot10=12+40=52\)
c: \(15\cdot24-14\cdot5\cdot\left(145:5-27\right)\)
\(=360-70\left(29-27\right)\)
=360-140
=220
d: \(18\cdot3-18\cdot2+3\cdot\left(\dfrac{51}{17}\right)\)
\(=18\left(3-2\right)+3\cdot3\)
=18+9
=27
e: \(64+115+36-25\cdot8\cdot6\cdot2^2\cdot3+4^2\)
\(=100+115-200\cdot6\cdot4\cdot3+16\)
\(=231-14400=-14169\)
f: \(15\cdot8-\left(17-30+83\right)-144:6\)
\(=120-24-\left(100-30\right)\)
=96-70
=26
315 + ( 146 - x ) = 401
146 - x = 401 - 315
146 - x = 86
x = 146 - 86
x = 60
x - 36 : 18 = 12
x - 2 = 12
x = 12 + 2
x = 14
( x - 36 ) : 18 = 12
x - 36 = 216
x = 216 + 36
x = 252
**** cho mình nha! Cảm ơn bạn!
315+(146-x)=401
146 - x =401-315
146-x = 86
x =146-86
x =60
x-36:18=12
x - 2 =12
x =12-2
x =10
(x-36):18=12
x-36 =12x18
x-36 =216
x =216-36
x = 180
`a, 504 : (16-3x)=72`
`<=> 16-3x=7`
`<=>3x=9`
`<=>x=3`
`b,272-(4x+15)=45`
`<=>4x+15=227`
`<=>4x=212`
`<=>x=53`
a: =>16-3x=504:72=7
=>3x=9
=>x=3
b: =>4x+15=272-45=227
=>4x=212
=>x=53
b/ =-36.16+36.41-16.41+16.36
=36.41-16.41
=41.(36-16)
=41.20
=820
A) 18 x ( 16 - 16 ) = 0
= 18 x 0
= 0
B) ( x -15) x 72 =0
( x -15) = 0:72
( x -15) = 0
x = 0+15
x = 15
\(272+\left(146+x\right)=118\)
\(272+146+x=118\)
\(418+x=118\)
\(x=118-418\)
\(x=-300\)
Bài làm
a) 272+ ( 146 + x ) = 118
146 + x = 272 - 118
146 + x = 154
x = 154 - 146
x = 8
Vậy x = 8
b) 272 - ( 4.x + 15 ) = 45
4x + 15 = 272 - 45
4x + 15 = 227
4x = 227 - 15
4x = 112
x = 112 : 4
x = 28
Vậy x = 28
c) x - 36 : 18 = 16
x - 2 = 16
x = 18
Vậy x = 18
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