giải pt sau
(x-13/501)+(x-17/2000)=(x-15/1001)+9x-16/667)
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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
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
x−1189+x−1387+x−1585+x−1783=4x−1189+x−1387+x−1585+x−1783=4=>(x−1189−1)+(x−1387−1)+(x−1585−1)+(x−1783−1)=0=>(x−1189−1)+(x−1387−1)+(x−1585−1)+(x−1783−1)=0=>x−10089+x−10087+x−10085+x−10083=0=>x−10089+x−10087+x−10085+x−10083=0=>(x−100)(189+187+185+183)=0=>(x−100)(189+187+185+183)=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
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
nhầm (x-16/667)