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a, (x - 29) - 11 = 0
(x - 29) = 0 + 11
x = 11 + 29 = 40
b, 231 + (321 - x) = 531
(321 - x) = 531 - 231
x = 321 - 300 = 21
c, (4 . x + 5) : 3 - 121 : 11 = 4
(4 . x + 5) : 3 - 11 = 4
(4 . x + 5) : 3 = 4 + 11
(4 . x + 5) = 15 : 3
4 . x = 5 - 5
x = 0 : 4 = 0
d, 131 . x - 941 = 27 . 23
131 . x - 941 = 210 = 1024
131 . x = 1024 + 941
x = 1965 : 131 = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (x - 29) - 11 = 0
x - 29 = 0 + 11
x - 29 = 11
x = 29 + 11
x = 40
b) 231 + (321 - x) = 531
231 + 321 - x = 531
552 - x = 531
x = 552 - 531
x = 21
a) (x - 29) - 11 = 0
(x - 29) = 0 + 11
x - 29 = 11
x = 11 + 29
x = 40
b) 231 + (321 - x) = 531
(321 - x) = 531 - 231
321 - x = 300
x = 321 - 300
x = 21
c) (4 . x + 5) : 3 - 121 : 11 = 4
(4 . x + 5) : 3 - 11 = 4
(4 . x + 5) : 3 = 4 + 11
(4 . x + 5) : 3 = 15
(4 . x + 5) = 15 . 3
(4 . x + 5) = 45
4 . x + 5 = 45
4 . x = 45 - 5
4 . x = 40
x = 40 : 4
x = 10
d) 131 . x - 941 = 27 x 23
131 . x - 941 = 621
131 . x = 621 + 941
131 . x = 1562
x = 1562 : 131
x = 11.9236641221
Học tốt!!!
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a)215+((-38)-(-58))+(90-85)
215+20+5
(215+5)+20
220+20
240
![](https://rs.olm.vn/images/avt/0.png?1311)
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#giải:
125 . 456 + 456 . 31 - 256 . 444
= 456 . ( 125 + 31 ) - 256 . 444
= 456 . 256 - 256 . 444
= 256 . ( 456 - 444 )
= 256 . 12
= 3072
#By_Ami
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\(\left[1824-\left(526+2x\right)\right]+318=1420\)
\(\left[1824-\left(526+2x\right)\right]=1420-318\)
\(\left[1824-\left(526+2x\right)\right]=1102\)
\(526+2x=1824-1102\)
\(526+2x=722\)
\(2x=722-526\)
\(2x=196\)
\(x=196\div2\)
\(x=98\)
Vậy x = 98
![](https://rs.olm.vn/images/avt/0.png?1311)
(-321)-[(-321+35)-235]
=(-321)+321-35+235
=[(-321)+321]+[(-35)+235]
=0+200
=200
526 - 131 - 326 + 321
= (526 - 326) + (321 - 131)
= 200 + 190
= 390
\(\text{526-131-326+321=}\)\(\text{390}\)