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27x18+72x16-41x18
=3x9x9x2 +9x8x8x2 +41x9x2
=9x2x(3x9+8x8-41)
=18x(27+64-41)
=18x50
=900
chúc bn học tốt
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6x - 5 = 613
=> 6x = 613 + 5 = 618
=> x = 618 : 6 = 103.
0 : x = 0 => x là số nguyên nhưng x phải khác 0.
(x - 47) - 115 = 0
=> x - 47 = 115
=> x = 115 + 47 = 162
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a) 4.x - 15 = -75 - x
=> 4x + x = -75 + 15
=> 5x = -60
=> x = -60/5 = -12
b) 72 - 3.x = 5.x + 8
=> -3x - 5x = 8 - 72
=> -8x = -64
=> x = -64/-8 = 8
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A) 149 - ( 2x - 53 ) = 54
2x - 53 = 149 - 54
2x - 53 = 95
2x = 95 + 53
2x = 148
x = 148 : 2
x = 74
B) 47 - 3( 2x - 18 ) = 35
3( 2x - 18 ) = 47 - 35
3( 2x - 18 ) = 12
2x - 18 = 12 : 3
2x - 18 = 4
2x = 4 + 18
2x = 22
x = 22 : 2
x = 11
C) 2x - 105 : 21 = 15
2x - 5 = 15
2x = 15 + 5
2x = 20
x = 20 : 2
x = 10
D) ( 2x - 105 ) : 21 = 15
2x - 105 = 15 x 21
2x - 105 = 315
2x = 315 + 105
2x = 420
x = 420 : 2
x = 210
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Bài 2 :
a) 34 + ( 9 - 21 ) =2017 - (x +2017)
34 + 9 - 21 =2017 - x -2017
22=-x
x=-22
b) (15-x)+(x-12) =7-(-8+x)
15-x+x-12 =7+8-x
3=15-x
x=12
c) x-(11-x) = - 48 + (-12 + x
x-11+x = - 48 -12 + x
2x-11=-60+x
2x-x=-60+11
x=-49
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( x - 34 ) . 15 = 0
x - 34 = 0 : 15
x - 34. = 0
x. = 0 + 34
x. = 34
18 . ( x - 16 ) = 18
x - 16. = 18 : 18
x - 16. = 1
x = 1 + 16
x = 17
Chúc bn hok tốt ~
t mk nha cảm ơn
( x - 34 ). 15=0
x-34 = 0.15
x-34 = 0
x = 34+0
x = 34
18.(x-16) = 18
x-16 = 18:18
x-16 = 1
x = 16 + 1
x = 17
*******************CHÚC BẠN HỌC TỐT ***************
( 15 - x ) + ( 18 - x ) + ( 21 - x ) + ... + ( 72 - x ) = 590 ( có 20 số hạng )
=> ( 15 + 18 + 21 + ... + 72 ) - 20x = 590
=> ( 72 + 15 ) . 20 : 2 - 20x = 590
=> 870 - 20x = 590
=> 20x = 280
=> x = 14
( 15 - x ) + ( 18 - x ) + ( 21 - x ) + ... + ( 72 - x ) = 590 ( có 20 số hạng )
\(\Rightarrow\) ( 15 + 18 + 21 + ... + 72 ) - 20x = 590
\(\Rightarrow\) ( 72 + 15 ) . 20 : 2 - 20x = 590
\(\Rightarrow\) 870 - 20x = 590
\(\Rightarrow\) 20x = 280
\(\Rightarrow\) x = 14