(17-3x)^3+36=161
(-17).39+17.(-161)
Bài 1: Tìm số tự nhiên x, biết:
a,36 : [ 7(x - 3) + 4 ] = 24 :23
b,[(6x - 39) : 3 ] . 28 = 5628
c,(2x -7) - (x + 135)=0
d,24 .125 + 52 . 25
e,17 . 27 +17 . 25 + 17 . 48
g,122 + (37 - 3x) = 0
h,(14 - 3x) + (6+x) = 0
a) 3x + 2 . (-7) = 10
b) 25 -(30 + x) = - (27 - 8)
c) 15 - x = 12 - ( -14)
d) (4x + 11) - ( x + 34) = 67
e) 3 - 17 - x = 289 - (36 + 289)
a: =>3x=10+14=24
=>x=8
b: =>25-30-x=-19
=>-5-x=-19
=>x+5=19
=>x=14
c: =>15-x=12+14=26
=>x=-11
d: =>4x+11-x-34=67
=>3x-23=67
=>3x=90
=>x=30
e: =>-x-14=289-36-289=-36
=>x+14=36
=>x=22
a) 3x=24
x=8
b) 25-30-x=-19
25-30+19=x
14=x
c) 15-x=26
x=-11
d) 4x+11-x-34=67
3x=90
x=30
e) -14-x= -36
x=-14 -36
x= 22
a) 83 - (-756 - 17) + (50 - 756)
b) -105 + (-34 - 95) - 166
c) -(39 + 228 - 407) + (118 - 161)
d) 5^10 : 5^8 + 60 : 12 + (-10)
e) -342 - (161 - 342) - 39
g) 7^5 : 7^3 + (-187 - 149) - 213
Câu a, b, c, e bạn áp dụng quy tắc đấu ngoặc để mở ngoặc rồi tính
Câu d, g bạn tính như bình thường
a) 83 - (-756 - 17) + (50 - 756)
b) -105 + (-34 - 95) - 166
c) -(39 + 228 - 407) + (118 - 161)
d) 5^10 : 5^8 + 60 : 12 + (-10)
e) -342 - (161 - 342) - 39
g) 7^5 : 7^3 + (-187 - 149) - 213
\(a.83-\left(-756-17\right)+\left(50-756\right)=83+756+17+50-756=\left(83+17\right)+50+\left(756-756\right)=100+50=150\)
\(b.-105+\left(-34-95\right)-166=-105+\left(-34\right)-95-166=\left(-105-95\right)-\left(34+166\right)=\left(-200\right)-200=-400\)
\(c,-\left(39+228-407\right)+\left(118-161\right)=-39-228+407+118-161=\left(-39-161\right)-\left(228-118\right)+407=\left(-200\right)-110=-310\)
\(d,5^{10}:5^8+60:12+\left(-10\right)=5^2+5+\left(-10\right)=5\left(5+1-2\right)=5.4=20\)
\(e,-342-\left(161-342\right)-39=-342-161+342-39=\left(-342+342\right)-\left(161+39\right)=-200\)\(g,7^5:7^3+\left(-187-149\right)-213=7^2+\left(-187\right)-149-213=\left(49-149\right)-\left(187+213\right)=\left(-100\right)-400=-500\)
5- ( -3 )
-5 - 3
-5 - ( -3 )
15- ( -7 )
-15 - ( -17 )
-15 - -17
25 - 36
25 - ( -36 )
-25 - ( -36 )
-25 - 36
17 - 21
17- ( -21 )
-17 - 21
-17 - (-21 )
timGTLNhoac GTNN cua:
A= /-x+8/-21
B= /-x-17/+/y-36/+12
D= -/2x-8/-35
D=3(3x-12)2 -37
a} 3/20+3/30 + 3/42 + ....3/110+3/132
b} 17/36 . 13/15+ 12/15 - 17/36 - 1/36
2 h 30 chiều nay mình phả đi học rồi , làm ơn giúp mình vói mình xin cảm ơn và sẽ k
\(a,\frac{3}{20}+\frac{3}{20}+\frac{3}{42}+...+\frac{3}{132}\)
\(=3\left(\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+...+\frac{1}{11\cdot12}\right)\)
\(=3\left(\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{11}-\frac{1}{12}\right)\)
\(=3\left(\frac{1}{4}-\frac{1}{12}\right)\)
\(=3\cdot\frac{1}{6}=\frac{1}{2}\)
a) \(\frac{3}{20}+\frac{3}{30}+\frac{3}{42}+...+\frac{3}{132}\)
= \(3\times\left(\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+...+\frac{1}{132}\right)\)
= \(3\times\left(\frac{1}{4\times5}+\frac{1}{5\times6}+\frac{1}{6\times7}+...+\frac{1}{11\times12}\right)\)
= \(3\times\left(\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{11}-\frac{1}{12}\right)\)
= \(3\times\left(\frac{1}{4}-\frac{1}{12}\right)\)
= \(3\times\frac{1}{6}\)
= \(\frac{1}{2}\)
Tìm x:
a) \(3x\left(3x-8\right)-9x^2+8=0\)
b)\(6x-15-x\left(5-2x\right)=0\)
c) \(x^3-16x=0\)
d) \(2x^2+3x-5=0\)
e) \(3x^2-x\left(3x-6\right)=36\)
f) \(\left(x+2\right)^2-\left(x-5\right)\left(x+1\right)=17\)
g) \(\left(x-4\right)^2-x\left(x+6\right)=9\)
h) \(4x\left(x-1000\right)-x+1000=0\)
i) \(x^2-36=0\)
j) \(x^2y-2+x+x^2-2y+xy=0\)
k) \(x\left(x+1\right)-\left(x-1\right).\left(2x-3\right)=0\)
l) \(3x^3-27x=0\)