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\(11\left(x-6\right)=4x+11\Leftrightarrow11x-4x=11+66\Leftrightarrow7x=77\Leftrightarrow x=11\)
11(x-6)=4x+11
=>11x-4x=11+66
=>7x=77
=>x=77:7
=>x=11
vậy x=11
11x(X-6)=4xX+11
11xX-11x6=4xX+11
11xX-66=4xX+11
11xX=4xX+11+66
11xX-4xX=11+66
(11-4)xX=77
7xX=77
X=77:7
X=11
11 x (X-6)=4 x X +11
=> 11 x X - 11 x 6=4 x X +11
=> 11 x X - 66 = 4 x X+11
=> 11 x X - 4 x X = 11+66
=> (11-4) x X = 77
=> 7 x X=77
=> X=77:7
=> X=11
11 x X - 11 x 6 = 4 x X + 11
11 x x - 66 = 4 x X + 11
11 x X - 4 x X = 66 + 11
11 x X - 4 x X = 77
( 11 - 4 ) x X = 77
7 x X = 77
X = 77 : 7
X = 11
P/s : k mình nha !
11 x (X-6)=4 x X +11
=> 11 x X - 11 x 6=4 x X +11
=> 11 x X - 66 = 4 x X+11
=> 11 x X - 4 x X = 11+66
=> (11-4) x X = 77
=> 7 x X=77
=> X=77:7
=> X=11
A = \(\frac{1}{1.2.4}+\frac{1}{2.4.5}+...+\frac{1}{8.10.11}+\frac{1}{10.11.13}\)
3 x A = \(\frac{3}{1.2.4}+\frac{3}{2.4.5}+...+\frac{3}{8.10.11}+\frac{3}{10.11.13}\)
3 x A = \(\frac{1}{1.2}-\frac{1}{2.4}+\frac{1}{2.4}-\frac{1}{4.5}+...+\frac{1}{8.10}-\frac{1}{10.11}+\frac{1}{10.11}-\frac{1}{11.13}\)
3 x A = \(\frac{1}{1.2}-\frac{1}{11.13}=\frac{1}{2}-\frac{1}{143}=\frac{143}{286}-\frac{2}{286}=\frac{141}{286}\)
A = \(\frac{141}{286}:3=\frac{141}{286.3}=\frac{47}{286}\)
11x(x-6)=(4*x)+11
11x-66=4x+11
11x-4x=66+11
7x=77
x=77:7
x=11
Vậy x=11