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Tham khảo :
\(272+\left(146-x\right)=118\)
\(146-x=118-272\)
\(146-x=-154\)
\(x=146-\left(-154\right)\)
\(\Rightarrow x=300\)
\(504:\left(16-3x\right)=72\)
\(16-3x=504:72\)
\(16-3x=7\)
\(3x=16-7\)
\(3x=9\)
\(x=9:3\)
\(\Rightarrow x=3\)

\(272+\left(146+x\right)=118\)
\(272+146+x=118\)
\(418+x=118\)
\(x=118-418\)
\(x=-300\)

124 + (118-x)=217
=> 118-x=217-124
=> 118-x=93
=> x=118-93
=> x=25
(x-47)-115=0
=> x-47=0+115
=> x-47=115
=> x=115+47
=> x=162
315+(146-x)=401
=> 146-x=401-315
=> 146-x=86
=> x=146-86
=> x=60
124+(118-x)=217 => 118-x=217-124=> 118-x=93=> x=118-93 => x=25
(x-47)-115=0 => x-47=0+115=>x-47=115=>x=115+47=>x=162
315+(146-x)=401=>146-x=401-315=>146-x=86=>x=146-86=>x=60

\(124 - (118 - x) = 217\)
\(118-x=124-217\)
\(118-x=-93\)
\(x=118-\left(-93\right)\)
\(x=211\)
\(---\)
\(315+(146-x)=401\)
\(146-x=401-315\)
\(146-x=86\)
\(x=146-86\)
\(x=60\)
\(---\)
\(575-(6x+70)=445\)
\(6x+70=575-445\)
\(6x+70=130\)
\(6x=130-70\)
\(6x=60\)
\(x=60:6\)
\(x=10\)
\(---\)
\(315+(125-x)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(x=125-120\)
\(x=5\)
#\(Toru\)
124 - ( 118 - x ) = 217
118 - x =124-217
118 - x =-93
x=118-(-93)
x= 211
315 + ( 146 - x ) = 401 \
146 - x=401-315
146 - x= 83
x= 146-83
x=63
575 - ( 6x + 70 ) = 445
6x + 70=575-445
6x + 70=130
6x=130-70
6x =60
x=60:6
x=10
315 + ( 125 - x ) = 435
125 - x=435-315
124-x=120
x=124-120
x=4

b: Ta có: 7x-8=713
nên 7x=721
hay x=103
c: Ta có: x-36:18=12
nên x-2=12
hay x=14
d: Ta có: (x-36):18=12
nên x-36=216
hay x=252

a/ \(\left(x-35\right)-120=0\)
\(\Leftrightarrow x-35=0+120\)
\(\Leftrightarrow x-35=120\)
\(\Leftrightarrow x=120+35\)
\(\Leftrightarrow x=155\)
Vậy ...
b/ \(124+\left(188-x\right)=217\)
\(\Leftrightarrow188-x=217-124\)
\(\Leftrightarrow188-x=93\)
\(\Leftrightarrow x=95\)
Vậy ...
b/ \(156-\left(x+61\right)=82\)
\(\Leftrightarrow x+61=74\)
\(\Leftrightarrow x=13\)
Vậy ..

136 x 68 + 12 x 272
=136 x 2 x 34 + 12 x 272
=272 x 34 + 12 x 272
=272 x (34 + 12)
=272 x 46
=12512

136 x 68 + 16 x 272
= 136 x 68 + 16 x 136 x 2
= 136 x (68 + 16 x 2)
= 136 x (68 + 32)
= 136 x 100
= 13600
Dễ mà bạn
136x68+16x272
=136x68+(16x2)x(272:2)
=136x68+32x136
=136x(68+32)
=136x100=13600

2x + 2x + 4= 272
2x + 2x= 272-4
2x + 2x =268
2.( 2x )=268
2x=268:2
2x=134
2x=đề saI
\(272-\left(146+x\right)=118.\)
\(146+x=272-118\)
\(146+x=154\)
\(x=154-146\)
\(x=8\)
272-[146+x ]=118
146+x =154
x=8