|x|-|-5,25|=|10,75|
Mọi ngừi ơi giúp mềnh nhaaaa
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\(\left|x\right|-\left|-5,25\right|=\left|10,75\right|\)
\(\left|x\right|-5,25=10,75\)
\(\left|x\right|=10,75+5,25\)
\(\left|x\right|=16\)
Vậy \(x=16\)
|x|-|-5,25|=|10,75|
<=>|x|-5,25=10,75
<=>|x| =10,75+5,25
<=>|x| =16
x đc chia làm 2 trường hợp
x=16 và x=-16
Vậy x=16 hoặc x=-16
#Chúc bạn hok tốt
ta có :
\(3^{x+1}-3^x=3^x.3-3^x=2.3^x=162\)
\(\Leftrightarrow3^x=81=3^4\Leftrightarrow x=4\)
a. 2904,02-152,36-547,64
= 2904,02- (152,36+547,64)
= 2904,02- 700
= 2204.02
b. 38,25- 18,25+ 21,64-11,64
= 20+ 10
=30
c. 513,76- 62,8+49,04
= (513,76+49,04) -62,8
=562,8-62,8
=500
Đây nè bài này dễ lắm ý=))
\(\sqrt{20}-\sqrt{45}+\sqrt{6+2\sqrt{5}}=\sqrt{2^2.5}-\sqrt{3^2.5}+\sqrt{\left(\sqrt{5}+1\right)^2}=2\sqrt{5}-3\sqrt{5}+\sqrt{5}+1=1\)
\(\sqrt{20}-2-\sqrt{\left(\sqrt{5}-2\right)^2}=2\sqrt{5}-2-\left|\sqrt{5}-2\right|=2\sqrt{5}-2-\sqrt{5}+2=\sqrt{5}\)
\(\left(\sqrt{27}+3\sqrt{12}-2\sqrt{3}\right):\sqrt{3}=\left(3\sqrt{3}+6\sqrt{3}-2\sqrt{3}\right):\sqrt{3}=7\sqrt{3}:\sqrt{3}=7\)
\(\sqrt{50}-3\sqrt{8}+\sqrt{\left(\sqrt{2}+1\right)^2}=\sqrt{5^2.2}-3\sqrt{2^2.2}+\sqrt{\left(\sqrt{2}+1\right)^2}=5\sqrt{2}-6\sqrt{2}+\sqrt{2}+1=1\)
1) \(A=\sqrt{20}-\sqrt{45}+\sqrt{6+2\sqrt{5}}\)
\(=2\sqrt{5}-3\sqrt{5}+\sqrt{5}+1\)
=1
2) Ta có: \(B=\sqrt{20}-2-\sqrt{\left(\sqrt{5}-2\right)^2}\)
\(=2\sqrt{5}-2-\sqrt{5}+2\)
\(=\sqrt{5}\)
a) \(\dfrac{2x}{3}\)+\(\dfrac{2x-1}{6}\)=4 - \(\dfrac{x}{3}\)
<=>\(\dfrac{2x}{3}\)+\(\dfrac{2x-1}{6}\) - 4+\(\dfrac{x}{3}\)=0
<=>\(\dfrac{2x.2+2x-1-4.6+x.2}{6}\)=0
=>4x-2x-24+2x=0
<=>4x-24=0
<=>4x=24
<=>x=6
Vậy x=6
b)\(\dfrac{x-1}{2}\)+\(\dfrac{x-1}{4}\)=1 - \(\dfrac{2\left(x-1\right)}{3}\)
<=>\(\dfrac{x-1}{2}\)+\(\dfrac{x-1}{4}\)-1+\(\dfrac{2\left(x-1\right)}{3}\)=0
<=>\(\dfrac{6.\left(x-1\right)+3\left(x-1\right)-1.12+4.2\left(x-1\right)}{12}\)=0
=>6x-6+3x-3-12+4x-4+2x-2=0
<=>15x-27=0
<=>15x=27
<=>x=\(\dfrac{9}{5}\)
Vậy x=\(\dfrac{9}{5}\)
\(\left|x\right|-\left|-5,25\right|=\left|10,75\right|\)
\(\Rightarrow\left|x\right|-5,25=10,75\)
\(\Rightarrow\left|x\right|=10,75+5,25\)
\(\Rightarrow\left|x\right|=16\)
Vậy x = 4 hoặc x = -4.
tick mik nha
Thanks nhaa