tìm x biết {x2-[62-(82-9.7)37.5)3-5.33} = 1
1. Tìm y, biết:
a) 48751 - (10425 + y) = 3828 : 12
b) (2367 - y) - (210 - 7) = 152 - 20
2. Tìm số tự nhiên x biết rằng: 8.6 + 288 : (x - 3)2 = 50
3. Tìm số tự nhiên x biết rằng: {x2 - [62 - (82 - 9.7)2 - 7.5]3 - 5.3}3 = 1
4. Tìm số tự nhiên x và y biết rằng:
a) 663.851 : x = 897 b) 9187 - y : 409 = 892 - 102 5.Xét xem các đẳng thức đúng hai:
a) 102+112+122 = 132+142
b) 152+162+172 = 182+192
c) 212+222+232+242 = 252+262+272
Bài 1:
a: Ta có: \(48751-\left(10425+y\right)=3828:12\)
\(\Leftrightarrow y+10425=48751-319=48432\)
hay y=38007
b: Ta có: \(\left(2367-y\right)-\left(2^{10}-7\right)=15^2-20\)
\(\Leftrightarrow2367-y=1222\)
hay y=1145
Bài 2:
Ta có: \(8\cdot6+288:\left(x-3\right)^2=50\)
\(\Leftrightarrow288:\left(x-3\right)^2=2\)
\(\Leftrightarrow\left(x-3\right)^2=144\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=12\\x-3=-12\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=15\\x=-9\end{matrix}\right.\)
Tìm X
e) – 40 – (– 3 – 33) + (40 – x) = – (– 47) f) x(3x – 9). (121 – x2) = 0
g) – 62 – (38 + x) + 2x = – 100 h) (x + 1)2.(x2 + 1) = 0
i) (x – 12) – (2x + 31) = 6 k) 17/ (x + 3)3 : 3 – 1 = – 10
e: =>-40+3+33+40-x=47
=>36-x=47
=>x=-11
f: =>x(x-3)(11-x)(11+x)=0
hay \(x\in\left\{0;3;11;-11\right\}\)
g: =>-62-38-x+2x=-100
=>x-100=-100
hay x=0
Tìm X
e) – 40 – (– 3 – 33) + (40 – x) = – (– 47) f) x(3x – 9). (121 – x2) = 0
g) – 62 – (38 + x) + 2x = – 100 h) (x + 1)2.(x2 + 1) = 0
i) (x – 12) – (2x + 31) = 6 k) 17/ (x + 3)3 : 3 – 1 = – 10
Tìm X
e) – 40 – (– 3 – 33) + (40 – x) = – (– 47) f) x(3x – 9). (121 – x2) = 0
g) – 62 – (38 + x) + 2x = – 100 h) (x + 1)2.(x2 + 1) = 0
i) (x – 12) – (2x + 31) = 6 k) 17/ (x + 3)3 : 3 – 1 = – 10
i: =>x-12-2x-31=6
=>-x-43=6
=>x+43=-6
hay x=-49
h: =>(x+1)=0
=>x=-1
f: =>x(x-3)(x+11)(x-11)=0
hay \(x\in\left\{0;3;-11;11\right\}\)
tìm số x biết x^2-(6^2-(8^2-9.7)^3-7.5)^3=89-102.
câu này cũng dễ, tick cho mình nha:(ko ghi lại đề)
->x^2-(6^2-1^3-35)^3=(-13)
->x^2-0^3=(-13)
->x^2-0=(-13)
->x^2=(-13)
->x=chịu(nhưng tick cho mình nha)
Tìm x:
x^2-[6^2-(8^2-9.7)^3-7.5]7.7}^3=1
Tìm x biết x2 - [62 - (82 - 9.7)3 - 7.5]3 = 118 - 102
B1:Viết dưới dạng 1 lũy thừa:
a)a4.a5:a3
b)m6.m.m7:m3
c)100.10000000:1000
d)132-122
B2:tìm x biết:
a)3(24-x2)-10=14
b)(x-2)3+23=62-1
c)2x+2x+3=72
2/a/ 3(24-2x)-10=14
=>3(24-2x)=14+10
=>3(24-2x)=24
=>24-2x=24:3
=>24-2x=8
=>2x=24-8
=>2x=16
=>x=16:2
=>x=8
tíc mình nha
{y2-[62-(82-9*7)3-7*53]-5*3}3=1
=>{y^2-36+(64-63)^3+7*125-15}^3=1
=>{y^2-51+875+1}=1
=>y^2=-824(vô lý)
\(\left\{y^2-\left[6^2-\left(8^2-9\cdot7\right)^3-7\cdot5^3\right]-5\cdot3\right\}^3=1\)
\(\Rightarrow\left\{y^2-\left[6^2-\left(64-63\right)^3-875\right]-15\right\}^3=1\)
\(\Rightarrow\left\{y^2-\left[36-1^3-875\right]-15\right\}^3=1\)
\(\Rightarrow\left[y^2-\left(-840\right)-15\right]^3=1\)
\(\Rightarrow\left(y^2+840-15\right)^3=1\)
\(\Rightarrow\left(y^2+825\right)^3=1\)
\(\Rightarrow\left(y^2+825\right)^3=1^3\)
\(\Rightarrow y^2+825=1\)
\(\Rightarrow y^2=1-825\)
\(\Rightarrow y^2=824\)
\(\Rightarrow y=2\sqrt{206}\)