b: \(\Leftrightarrow x-15-27-x+x-13=-1\)

\(\Leftrightarrow x-55=-1\)

hay x=54

Sửa đề: =11

=>\(\dfrac{x-15}{17}-5+\dfrac{x-36}{16}-4+\dfrac{x-76}{12}-2=11-5-4-2=0\)

=>x-100=0

=>x=100

1. \(x:\left(1001:13\right)=29\)

\(\Leftrightarrow x:77=29\)

\(\Leftrightarrow x=2233\)

2. \(x:\left(15\cdot17\right)=8\)

\(\Leftrightarrow x:255=8\)

\(\Leftrightarrow x=2040\)

P/s: Có thế tính sai :<

x:(1001:13)=29

x:77=29

x=29x77=2233

x:(15x17)=8

x:225=8

x=225x8=2040

\(a)x:(1001:13)=29\)

\(\Rightarrow x:77=29\)

\(\Rightarrow x=29\times77=2233\)

\(b)x:(15\times17)=8\)

\(\Rightarrow x:255=8\)

\(\Rightarrow x=8\times255=2040\)

:))) khó quá

x-3/13+x-3/14=x-3/15+x-3/16

<=> x-3/13+x-3/14-x-3/15-x-3/16=0

<=> (x-3).(1/13+1/14-1/15-1/16)

<=> (x-3)=0 ( Vì 1/13+1/14-1/15-1/16>0)

<=> x-3=0 => x=3

Vậy x=3

Ta có: \(\sqrt{9x+9}+\sqrt{4x+4}-2\sqrt{16x+16}=\sqrt{x+1}-8\)

\(\Leftrightarrow3\sqrt{x+1}+2\sqrt{x+1}-8\sqrt{x+1}-\sqrt{x+1}=-8\)

\(\Leftrightarrow\sqrt{x+1}=2\)

\(\Leftrightarrow x+1=4\)

hay x=3

 $\frac{x-11}{89}+\frac{x-13}{87}+\frac{x-15}{85}+\frac{x-17}{83}=4$$=>\left(\frac{x-11}{89}-1\right)+\left(\frac{x-13}{87}-1\right)+\left(\frac{x-15}{85}-1\right)+\left(\frac{x-17}{83}-1\right)=0$$=>\frac{x-100}{89}+\frac{x-100}{87}+\frac{x-100}{85}+\frac{x-100}{83}=0$$=>\left(x-100\right)\left(\frac{1}{89}+\frac{1}{87}+\frac{1}{85}+\frac{1}{83}\right)=0$=> x-100 =0 => x=100Vậy nghiệm là 100 

ta có 0=\(\frac{x-11}{89}-1+\frac{x-13}{87}-1+\frac{x-15}{85}-1+\frac{x-17}{83}-1=0\)

0=\(\frac{x-11-89}{89}+\frac{x-13-87}{87}+\frac{x-15-85}{85}+\frac{x-17-83}{83}\)

0=\(\frac{x-100}{89}+\frac{x-100}{87}+\frac{x-100}{85}+\frac{x-100}{83}\)

0=(x-100)(\(\frac{1}{89}+\frac{1}{87}+\frac{1}{85}+\frac{1}{83}\))

vì \(\frac{1}{89}+\frac{1}{87}+\frac{1}{85}+\frac{1}{83}\)khác 0      suy ra x-100=0 

                                                                                    x=100

x−11/89+x−13/87+x−15/85+x−17/83=4

=>(x−11/89−1)+(x−13/87−1)+(x−15/85−1)+(x−17/83−1)=0

=>x−100/89+x−100/87+x−100/85+x−100/83=0

=>(x−100)(1/89+1/87+1/85+1/83)=0

=> x-100 =0 

Vậy nghiệm là 100

a: \(\dfrac{3x-7}{2}+\dfrac{x-1}{3}=-16\)

\(\Leftrightarrow3\left(3x-7\right)+2\left(x-1\right)=-96\)

\(\Leftrightarrow9x-21+2x-2=-96\)

=>11x=-73

hay x=-73/11

b: \(x-\dfrac{x-1}{3}=\dfrac{2x+1}{5}\)

=>15x-5(x-1)=3(2x+1)

=>15x-5x+5=6x+3

=>10x+5=6x+3

=>4x=-2

hay x=-1/2

c: \(\dfrac{2x-1}{3}-\dfrac{5x+2}{7}=x+13\)

=>14x-7-15x-6=21(x+13)

=>21x+273=-x-13

=>22x=-286

hay x=13

a, 45 x 46 + 45 x 45 - 30 - 15= 45x( 46+45) -30 -15= 45 x 91 - 30 - 15= 4095 - 30 - 15= 4050

b, 891 x 29 + 29 x 8+ 29= 29 x ( 891 + 8+ 1)= 29 x 900= 26100

c, 73 x ( 84+17) + 27 x (74+27)= 73 x 101 + 27 x 101= 101 x ( 73+27)= 101 x 100= 10100

d, chịu

d, đề bài= 13 x ( 99 + 2) + 13 x 1001+ 11 x 1300= 13 x 101 + 13 x 1001+ 13 x 1100= 13 x ( 101 + 1001 + 1100) = 13 x 2202= 28626