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a) (2x-32):16=3
2x-32=3.16
2x-32=48
2x=48+32
2x=80
x=80:2
x=40
b) (7x -8:2):5=8
(7x-4):5=8
7x-4=8.5
7x-4=40
7x=40+4
a) (2x - 32) : 16 = 3 \(=\left(2x-32\right)=3.16=48\)
= \(\left(2x-32\right)=48\)
= \(2x=48+32=80\)
= \(2x=80\Rightarrow x=80:2=40\)
b) ( 7x - 8 :2) : 5 = 8
= \(\left(7x-8:2\right)=8.5=40\)
= \(\left(7x-8:2\right)=40\)
= \(\left(7x-8\right)=40.2=80\)
= \(\left(7x-8\right)=80\)
= \(7x=80+8=88\)
=>x = 88 : 7 = ......
c) 215 + ( x - 21) : 2 = 235
\(=\left(x-21\right):2=235-215=20\)
= \(\left(x-21\right):2=20\)
= \(\left(x-21\right)=20.2=40\)
= \(\left(x-21\right)=40\)
= \(\Rightarrow x=40+21=61\)
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b. 14 . 29 + 14 . 71 + (1+2+3+....+99) . (199199 . 198 -198198 . 199)
=14.(29+71)+(1+2+3+....+99) . (199.1001 . 198 -198198 . 199)
=14.100+(1+2+3+....+99) . (198198 . 199 -198198 . 199)
=1400+(1+2+3+....+99) .0
=1400
a. 215 . 62 + 42 - 52 . 215
=215.(62-52)+42
=215.10+42
=2150+42
=2192
Tick mình đúng nha bạn !!!!!!!!!!!!!!!
a)
215 . 62 + 42 - 52 . 215
= 215 . ( 62 + 42 - 52 )
= 215 . 52
= 215 . ( 50 + 2 )
= 215 . 50 + 215 . 2
= 10750 + 430
= 11180
b) Nguyễn Hiền Phương làm đúng rồi
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a)1824 - { 526 + 2x } = 1420 - 318
1824 - { 526 + 2x } = 1102
526 + 2x = 1824 - 1102
526 + 2x = 722
2x = 722 - 526
2x = 196
x = 196 : 2
x = 98
b) [ 215 - { 3x - 18 } ] = 5225 : 25
[ 215 - { 3x - 18 } ] = 209
{ 3x - 18 } = 215 - 209
{ 3x - 18 } = 6
3x = 6 + 18
3x = 24
x = 24 : 3
x = 8
k cho minh nha
{1824 - ( 526 + 2x ) }+ 318 = 1420
{ 1824 - ( 526 + 2x ) } = 1420 - 318
{ 1824 - ( 526 + 2x ) } = 1102
526 + 2x = 1824 - 1102
526 + 2x = 722
2x = 722 - 526
2x = 196
x = 196 : 2
x = 98
![](https://rs.olm.vn/images/avt/0.png?1311)
A = ( 2016 + 2017 ) - ( 2017 + 2018 ) + ( 2018 - 16 )
A = 2016 + 2017 - 2017 - 2018 + 2018 - 16
A = ( 2016 - 16 ) + ( 2017 - 2017 ) + ( 2018 - 2018 )
A = 2000 + 0 + 0
A = 2000
\(\left(1-2x\right)^3=-125\Rightarrow1-2x=-5.\)
\(\Rightarrow-2x=-6\Leftrightarrow x=3\)
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