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x + 2x + 3x + 4x + 5x = x + 28
x + 2x + 3x + 4x + 5x - x = 28
14x = 28
x = 28 : 14
x = 2
x + 2x + 3x + 4x + 5x = x + 28
=> x + 2x + 3x + 4x + 5x - x = 28
=> x x ( 1 + 2 + 3 + 4 + 5 - 1 ) = 28
=> x x 14 = 28
=> x = 28 : 14
=> x = 2
Vậy x = 2
Chúc bạn học tốt !!!
a) 245 - x = 27 b) 3x + 41 = 56 c) 238: 2x = 17 d) 3x - 90 = 24 e) 2x:5 = 124 h) 26 + 3x = 25 + 46
x = 245 - 27 3x = 56 -41 2x = 238: 17 3x = 24 + 90 2x = 124.5 6 + 3x = 71
x = 218 3x = 15 2x = 14 3x = 114 2x = 620 3x = 71 - 6
x = 15 : 3 x = 14: 2 x = 114: 3 x = 620:2 3x = 65
x = 5 x = 7 x = 38 x = 310 x = 65: 3
x = 21,66
\(a,245-x=27\)
\(x=245-27\)
\(x=218\)
\(b,3x+41=56\)
\(3x=56-41\)
\(3x=15\)
\(x=15:3\)
\(x=5\)
\(c,238:2x=17\)
\(2x=238:17\)
\(2x=14\)
\(x=14:2\)
\(x=7\)
\(d,3x-90=24\)
\(3x=24+90\)
\(3x=114\)
\(x=114:3\)
\(x=38\)
\(e,2x:5=124\)
\(2x=124\times5\)
\(2x=620\)
\(x=620:2\)
\(x=310\)
\(f,7x+4x=110\)
\(\left(7+4\right)x=110\)
\(11x=110\)
\(x=110:11\)
\(x=10\)
\(g,5x-x=444\)
\(\left(5-1\right)x=444\)
\(4x=444\)
\(x=444:4\)
\(x=111\)
\(h,26+3x=25+46\)
\(26+3x=71\)
\(3x=71-26\)
\(3x=45\)
\(x=45:3\)
\(x=15\)
Học tốt
a) 4 × (5 - x) = x
20 - 4x = x
x + 4x = 20
5x = 20
x = 20 : 5
x = 4
b) 1/2 (x - 14) = 2
x - 14 = 2 : 1/2
x - 14 = 4
x = 4 +14
x = 18
c) 18/13 + 3 × x = 3
3x = 3 - 18/13
3x = 21/13
x = 21/13 : 3
x = 7/13
d) đề khó hiểu
A ) 2/17 + 30/46 + 15/17 + 4/49 + 8/23=102/49
B ) 5/8 x ( 19/31 x 8/5 )=19/31
C ) 7/9 x 8/15 x 9/7 x 15/4=2
D ) 11/12 x 24/7 x 21/22=3
nhìu quá nên mk chỉ cho kết quả thôi nha ^-^!!!
\(3x+12=36\)
\(\Leftrightarrow3x=36-12\)
\(\Leftrightarrow3x=24\)
\(\Leftrightarrow x=24\div3\)
\(\Leftrightarrow x=8\)
\(4x+28=134\)
\(\Leftrightarrow4x=134-28\)
\(\Leftrightarrow4x=106\)
\(\Leftrightarrow x=106\div4\)
\(\Leftrightarrow x=\frac{53}{2}\)
\(5x-22=-17\)
\(\Leftrightarrow5x=22-17\)
\(\Leftrightarrow5x=5\)
\(\Leftrightarrow x=5\div5\)
\(\Leftrightarrow x=1\)
3x + 12 = 36
3x = 36 - 12
3x = 24
x = 8
4x + 28 = 134
4x = 134 - 28
4x = 106
x = 106 : 4
x = 26 , 5
5x - 22 = -17
5x = -17 + 22
5x = 5
x = 1
3x - 184 = -49
3x = -49 + 184
3x = 135
x = 135 : 3 = 45
4x + 12 = 56
4x = 56 - 12
4x = 44
x = 11
3x - 127 = - 22
3x = -22 + 127
3x = 105
x = 105 : 3 = 35
3x + 22 = 124
3x = 124 - 22 = 102
x = 102 : 3
x = 34
4x - 9 = 31
4x = 31 + 9 = 40
x = 40 : 4= 10
5x - 211 = -31
5x = -31 + 211
5x = 180
x = 180 : 5
x = 36