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a) -65 .( 87 - 17 ) -87 .( 17 - 65 )
= ( - 65 ) . 87 + 17 - 87 . 17 + 65
= { ( - 65 ) + 65 } . 87 + 17
= 0 . 87 + 17
= 17
b) -215 . [ 14 + ( -236 ) ] + 215 . ( 14 - 236 )
= -215 . 14 + ( - 236 ) + 215 . 14 - 236
= [ ( - 215 ) + 215 ] . 14 + { ( - 236 - 236 }
= 0 . 14 + 0
= 0
\(a.\left[\left(x+34\right)-50\right].2=56\\ \Leftrightarrow\left(x+34\right)-50=28\\ \Leftrightarrow x+34=78\\ \Rightarrow x=44\)
\(b.1045-\left[215-\left(3x-24\right)\right]=5\\ \Leftrightarrow215-\left(3x-24\right)=1040\\ \Leftrightarrow3x-24=-825\\ \Leftrightarrow3x=-801\\ \Rightarrow x=-267\)
\(c.\left[195-\left(15x-27\right)\right].39=4212\\ \Leftrightarrow195-\left(15x-27\right)=108\\ \Leftrightarrow15x-27=87\\ \Leftrightarrow15x=114\\ \Rightarrow x=7,6\)
a) [(x+34)] - 50] . 2 = 56
=x+34-50=56:2
=> x+34-50=28
->x=28+50-34
-> x=44
b,1045 - [ 215 - ( 3x - 24 )] = 5
1045-(215-3x+24)=5
1045-215+3x-24=5
1045-215-24-5=-3x
-> 801=-3x-> x=801:(-3)=-267
,c) [ 195 - ( 15x - 27)] . 39 = 4212
(195-15x+27).39=4212
(195-15x+27)=4212/39=108
195+27-108=15x
114=15x-> x=114/15=7,6
-
5225:[215-(3x-18)]=25
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
Vậy x=8
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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
Mình nghĩ là :
(-57) . (1 - 215) - 57 . 215
= 57 . 214 - 57 . 215
= 57 . (214 - 215)
= 57 . (-1)
= -57
(-57) x (1 - 215) - 57 x 215
= 57 x (-1) x (1 - 215) - 57 x 215
= 57 x (215 - 1) - 57 x 215
= 57 x 214 - 57 x 215
= 57 x (214 - 215)
= 57 x (-1)
= -57
Vậy ...
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
=>3^(x+1)=216
=>\(x\in\varnothing\)
`@` `\text {Ans}`
`\downarrow`
\(3^{x+1}-1=215\)
`=>`\(3^{x+1}=215+1\)
`=>`\(3^{x+1}=216\)
`=> x \in`\(\varnothing\)