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1) 3x - 6= 5x + 2
5x - 3x = -6 - 2
2x = -8
x = -4
2) 15 - x = 4x - 5
4x + x = 15 + 5
5x = 20
x = 4
Tương tự như trên
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c) x.(1+2+3+4+...+100)=0
x.5050=0
x=0:5050=0
Vậy x=0
d) x.(1+2+3+4+5+...+100)=5050
x.5050=5050
x=1
Vậy x=1
e) x+1+x+2+x+3+x+4+...+x+100=5050
(x+x+x+x+...+x)+(1+2+3+4+...+100)=5050
100 số hạng x
x.100+5050=5050
x.100=0
x=0
Vậy x=0
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+) 4x - 12 -11 - x - 58 = 0
3x - 81 = 0
3x = 81
x = 27
+) 5x - 2 + 3x -15 - x = 0
7x - 17 = 0
7x = 17
x = 17/7
+) 4x - 44 - 6x -15 + x = 0
-x -59 = 0
-x = 59
x = -59
5x-2+3(x-5)=x
5x-2+3x-15=x
5x+3x-x=15+2
7x=17
x=17/7
vậy x=17/7
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4.(x-3)-(11+x)=58
4x-3-11-x=58
4x-x=58+3+11
3x=72
x=72:3
x=24
vậy x=24
4(x-11)-2(3x)=15-x
4x-44-6x=15-x
4x-6x+x=15+44
-x=59
x=-59
vậy x=-59
b) ghi thiếu đề rui
\(4.\left(x-3\right)-\left(11+x\right)=58\)
\(4x-12-11-x=58\)
\(3x-23=58\)
\(x=27\)
câu b) tương tự nha
c) \(4x-44-6x=15-x\)
\(-44-2x=15-x\)
\(-44=15-x+2x\)
\(-44=15+x\)
\(x=-59\)
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3x+17\(⋮\)x+4\(\Rightarrow\)3x+12+5\(⋮\)x+4\(\Rightarrow\)3.(x+4) +5\(⋮\)x+4
Vì 3.(x+4)\(⋮\)x+4\(\Rightarrow\)5\(⋮\)x+4\(\Rightarrow\)x+4\(\in\){1;5;-1;-5}\(\Rightarrow\)x\(\in\){-3;1;-5;-9}
5x+13 \(⋮\) x+2\(\Rightarrow\)5x+10+3 \(⋮\) x+2\(\Rightarrow\)5.(x+2)+3 \(⋮\) x+2
Vì 5.( x+2) \(⋮\) x+2 \(\Rightarrow\)3\(⋮\)x+2\(\Rightarrow\)x+2\(\in\){1;3;-1;-3}\(\Rightarrow\)x\(\in\){-1;1;-3;-5}
đề bài tìm x ak
5(x + 4) - 3(x - 2) = x
=> 5x + 20 - 3x + 6 = x
=> 2x + 26 - x = 0
=> x + 26 = 0
=> x = 0 - 26
=> x = -26