giúp mình bài ni với
5x.5x+3=54+54+54+54+54
24+5.x=715:712
5.x -206=24.4
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\(\frac{x+5}{20}+\frac{x+5}{21}+\frac{x+5}{32}=\frac{x+5}{23}+\frac{x+5}{54}\)
\(\Leftrightarrow\frac{x+5}{20}+\frac{x+5}{21}+\frac{x+5}{32}-\frac{x+5}{23}-\frac{x+5}{54}=0\)
\(\Leftrightarrow\left(x+5\right)\left(\frac{1}{20}+\frac{1}{21}+\frac{1}{32}-\frac{1}{23}-\frac{1}{54}\right)=0\)
\(\Leftrightarrow x+5=0\)
\(\Leftrightarrow x=-5\)
a) Ta có : 5 x : 5 2 = 5 2 nên x = 4,
b) Ta có: 5 x + 1 : 5 = 5 4 nên x = 4.
c) Ta có : 4 2 x - 1 : 4 = 4 2 nên x = 2.
\(3,54\times73+0,46\times25+3,54\times26+0,46\times75+3,54\)
\(=3,54\times\left(73+26+1\right)+0,46\times\left(25+75\right)\)
\(=3,54\times100+0,46\times100\)
\(=354+46=400\)
5x-24=51
=>5x=51+24=75
=>x= 75:5=15
vậy x= 15
4+36:9+x=54
=>4+4+x=54
=>x=54-4-4=46
vậy x=46
a) 5 . x - 24= 1 + 50
5 . x - 24 = 51
5 . x = 51 + 24
5 . x = 75
x = 75 : 5
x = 15
b) 4 + 36 : 9 + x = 54
36 : 9 + x = 54 - 4
36 : 9 + x = 50
4 + x = 50
x = 50 - 4
x = 46
#họctốt
&YOUTUBER&
a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370
a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370
a: \(36=3^2\cdot2^2;60=2^2\cdot3\cdot5;90=3^2\cdot2\cdot5\)
=>\(ƯCLN\left(36;60;90\right)=2\cdot3=6\)
=>\(ƯC\left(36;60;90\right)=Ư\left(6\right)=\left\{1;-1;2;-2;3;-3;6;-6\right\}\)
b: \(45=3^2\cdot5;60=2^2\cdot3\cdot5;150=2\cdot3\cdot5^2\)
=>\(ƯCLN\left(45;60;15\right)=3\cdot5=15\)
\(45⋮x;60⋮x;150⋮x\)
=>\(x\inƯC\left(45;60;150\right)\)
=>\(x\inƯ\left(15\right)\)
mà 5<=x<=10
nên \(x=5\)
c: \(45=3^2\cdot5;54=3^3\cdot2;188=2^2\cdot47\)
=>\(ƯCLN\left(45;54;188\right)=1\)
\(45⋮x;54⋮x;188⋮x\)
=>\(x\inƯC\left(45;54;188\right)\)
=>\(x\inƯ\left(1\right)\)
mà 3<x<8
nên \(x\in\varnothing\)
\(5^x.5^{x+3}=5^4+5^4+5^4+5^4+5^4\\ 5^x\left(1+5^3\right)=5^4\left(1+1+1+1+1\right)\\ 5^x\left(1+125\right)=5^4.5\\ 5^x.126=5^5\\ \dfrac{5^5}{5^x}=126\\ \Rightarrow5-x=126\\ \Rightarrow x=5-126=-121\)
b,
\(24+5x=7^{15}:7^{12}\\ 24+5x=7^3\\ 24+5x=343\\ 5x=343-24\\ 5x=319\\ x=319:5=63,8\)
c,
\(5x-2006=2^4.4\\ 5x-2006=64\\ 5x=64+2006\\ 5x=2017\\ x=2017:5=414\)