4/5 : ( 7/2 +1/4) ngũ 2
@mn giúp mình với
A. 16 ngũ 6 chia 4 ngũ 2 .B 27 ngũ 8 : 9 ngũ 4 . C. 125 ngũ 4 : 25 ngũ 3 d. 4 ngũ 14 nhân 5 ngũ 28 E. 12 ngũ n chia 2 ngũ 2n
bài 2 . so sánh 3 ngũ 500 và 7 ngũ 300
b. 8 ngũ 5 và 3 nhân 4 ngũ 7
c. 202 ngũ 303 và 303 ngũ 202
d. 3 ngũ 21 và 2 ngũ 31 .
Giúp mình nhé
X-31=5 NGŨ 2
Thu gọn các tổng sau:
a.B=11+ 11 lũy thừa 2+ 11 lũy thừa 3+....+ 11 lũy thừa 1000
b.C=5+5 ngũ 2-5 ngũ 3+ 5 ngũ 4+....+5 ngũ 99+5 ngũ 100
Các bạn giải sớm giúp mình với!!!!
a, 5 ngũ 2 nhân 3 ngũ 5 nhân (3/5)ngũ 2
b, 4 nhân 32 nhân 2 ngũ 3 nhân 1/16
c, (-2 1/3 )ngũ 2 nhân (-1/4)ngũ 2
d, 9 ngũ 5 nhân 5 ngũ 7 phần 45 ngũ 7
e, 10 ngũ 3 + 5 nhân 10 ngũ 2 + 5 ngũ 3
a) \(5^2.3^5.\left(\frac{3}{5}\right)^2\)
\(=25.243.\frac{9}{25}\)
\(=6075.\frac{9}{25}\)
\(=2187\)
b) \(4.32.2^3.\frac{1}{16}\)
\(=4.32.8.\frac{1}{16}\)
\(=128.8.\frac{1}{16}\)
\(=1024.\frac{1}{16}\)
\(=64\)
c) \(\left(-2\frac{1}{3}\right)^2.\left(-\frac{1}{4}\right)^2\)
\(=\frac{49}{9}.\frac{1}{16}\)
\(=\frac{49}{144}\)
d) \(\frac{9^5.5^7}{45^7}\)
\(=\frac{9^5}{9^7}\)
\(=\frac{1}{9^2}=\frac{1}{81}\)
e) 103 + 5.102 + 53
= 1000 + 5.100 + 125
= 1005 . 12500
= 13505
P/s: Mũ not ngũ ^^
bài 9:tìm x
1) (x-3)^2-4=0
2) x^2-2x=24
3) (2x-1)^2+(x+3)^3-5(x+7)(x-7)=0
giúp mình với mn ơi
1) \(\left(x-3\right)^2-4=0\)
\(\Leftrightarrow\left(x-3-2\right)\left(x-3+2\right)=0\)
\(\Leftrightarrow\left(x-5\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=1\end{matrix}\right.\)
2) \(x^2-2x=24\)
\(\Leftrightarrow x^2-2x-24=0\)
\(\Leftrightarrow x^2+4x-6x-24=0\)
\(\Leftrightarrow x\left(x+4\right)-6\left(x+4\right)=0\)
\(\Leftrightarrow\left(x+4\right)\left(x-6\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=6\\x=-4\end{matrix}\right.\)
Mn ơi giúp mình ạ với ạ! Thanks kiu mn nhìu nhìu ạ!
Baøi 4: Tính tổng:
1/ 1 + (-2) + 3 + (-4) + . . . + 19 + (-20)
2/ 1 – 2 + 3 – 4 + . . . + 99 – 100
3/ 2 – 4 + 6 – 8 + . . . + 48 – 50
4/ – 1 + 3 – 5 + 7 - . . . . + 97 – 99
5/ 1 + 2 – 3 – 4 + . . . . + 97 + 98 – 99 - 100
1/ 1 + (-2) + 3 + (-4) + . . . + 19 + (-20)
=1-2+3-4+...+19-20
=(1-2)+(3-4)+...+(19-20)
=(-1)+(-1)+...+(-1)
=(-1).10
=-10
2/ 1 – 2 + 3 – 4 + . . . + 99 – 100
=(1-2)+(3-4)+...+(99-100)
=(-1)+(-1)+...+(-1)
=(-1).50
=-50
3/ 2 – 4 + 6 – 8 + . . . + 48 – 50
=(2-4)+(6-8)+...+(48-50)
=(-2)+(-2)+...+(-2)
=(-2).13
=-26
4/ – 1 + 3 – 5 + 7 - . . . . + 97 – 99
=(-1)+(3-5)+(7-9)+...+(97-99)
=(-1)+(-2)+(-2)+...+(-2)
=(-1)+(-2).45
=(-1)+(-90)
=(-91)
5/ 1 + 2 – 3 – 4 + . . . . + 97 + 98 – 99 - 100
=(1+2-3-4)+...+(97 + 98 – 99 - 100)
=(-4)+...+(-4)
=(-4).25
=-100
\(HT\)
1/ \(1+(-2)+3+(-4)+...+19+(-20)\)
\(=(-1+3+5+...+19)-(2+4+6+...+20)\)
\(=(19-1):2+1=10\)
\(=(1+19).10:2-(20+2).10:2\)
\(=100-110\)
\(=-10\)
2/ \(1 – 2 + 3 – 4 + . . . + 99 – 100\)
\(= ( 1 - 2 ) + ( 3 - 4) + .... + ( 99 - 100 )\)
\(= -1 + ( -1) + ....+ ( -1)\)
\(=(-1).50\)
\(=-50\)
3/ \( 2 – 4 + 6 – 8 + . . . + 48 – 50\)
\(= 2 +( – 4 + 6)+( – 8+10) + . . . +( -44+46)+ ( 48 – 50)\)
\(= 2+2+2+...+2+( -2) \)
\(= 2.12 +( -2 ) \)
\(=22\)
4/ \(-1+3-5+7-...+97-99\)
\(= ( -1 + 3 ) + ( -5 + 7 )+....+( -93 +95 ) + ( 97 - 99 )\)
\(= -2+( -2)+...+( -2)+2\)
\(= -2.24+2\)
\(=-46\)
5/ \( 1+2-3-4+...+97+98-99-100\)
\(= ( 1+2-3-4)+...+( 97+98-99-100)\)
\(= -4+...+( -4)\)
\(=(-4).25\)
\(=-100\)
Thanks mn nhìu nhaaaaaa! Chúc mn hok tốt ah! Xin lỗi mn nhìu nha mik k k đúng đc! Srr mn nhiều ah!!! T^T
Thực hiện phép tính hợp lý ( nếu có thể)
A) 4 ngũ 3.27-4 ngũ 3.23
B) 2448:[119-(23-24:2 ngũ 2)]-4 ngũ 2
C) 1024:2 ngũ 5+140:(38+2 ngũ 5)-7 ngũ 23:7 ngũ 21
D) 457.7-(9292-4927): 45+27 ngũ 2
F) 98.42-{50[18-2 ngũ 3):2+3 ngũ 2]}
G) 11 ngũ 25:11 ngũ 23-3 ngũ 5:(1 ngũ 10+2 ngũ 3)-60
H) 5 ngũ 20:(5 ngũ 15.6+5 ngũ 15.19)
I) 107-{38+[7.3 ngũ 2-24:6+(9-7) ngũ 3]:15}
K) 500-{5[409-(2 ngũ 3.3-21) ngũ 2]+10 ngũ 3}:15
L) 1000+(-670)+297+(-330)
M) -80-[-130-(12-4 ngũ) 2]+2002 ngũ 0
N) -|-|13|+|-25|+12
O) |-129|-119+|2-31|
Ô) 98.42-{50[(18-2) ngũ 3:2+3 ngũ 2|}
Ơ) 15+17+19+21+……+153+155
P) 23+9+33-74+5+27-12+56
Q) -5+12-9-23-56+74-33-27
R) 1+(-5)+11+(-15)+21+(-25)
tìm x biết: 4/5(2/3.x-9/5)-2/5.-3/7=15/4 giúp mình vs MN
\(\dfrac{4}{5}\left(\dfrac{2}{3}x-\dfrac{9}{5}\right)-\dfrac{2}{5}\cdot\dfrac{-3}{7}=\dfrac{15}{4}\)
\(\Rightarrow\dfrac{2}{5}\left(\dfrac{2}{3}x-\dfrac{9}{5}\right)-\dfrac{-6}{35}=\dfrac{15}{4}\)
\(\Rightarrow\dfrac{2}{5}\left(\dfrac{2}{3}x-\dfrac{9}{5}\right)+\dfrac{6}{35}=\dfrac{15}{4}\)
\(\Rightarrow\dfrac{2}{5}\left(\dfrac{2}{3}x-\dfrac{9}{5}\right)=\dfrac{15}{4}-\dfrac{6}{35}=\dfrac{501}{140}\)
\(\Rightarrow\dfrac{2}{3}x-\dfrac{9}{5}=\dfrac{501}{140}:\dfrac{2}{5}=\dfrac{501\cdot5}{28\cdot5\cdot2}=\dfrac{501}{56}\)
\(\Rightarrow\dfrac{2}{3}x=\dfrac{501}{56}+\dfrac{9}{5}=\dfrac{2001}{280}\)
\(\Rightarrow x=\dfrac{2001}{280}:\dfrac{2}{3}=\dfrac{2001\cdot3}{280\cdot2}=\dfrac{6003}{560}\)
Mn giúp mình với ạ!Mình cảm ơn!
3/2.(x-5/3)-4/5=x+1
\(\dfrac{3}{2}\)(\(x\) - \(\dfrac{5}{3}\)) - \(\dfrac{4}{5}\) = \(x\) + 1
\(\dfrac{3}{2}\) \(x\) - \(\dfrac{15}{6}\) - \(\dfrac{4}{5}\) = \(x\) + 1
\(\dfrac{3}{2}\)\(x\) - \(x\) = 1 + \(\dfrac{15}{6}\) + \(\dfrac{4}{5}\)
\(\dfrac{1}{2}\)\(x\) =\(\dfrac{43}{10}\)
\(x\) = \(\dfrac{43}{10}\) \(\times\) 2
\(x\) = \(\dfrac{43}{5}\)
\(\dfrac{3}{2}\left(x-\dfrac{5}{3}\right)-\dfrac{4}{5}=x+1\\ \Rightarrow\dfrac{3.\left(x-\dfrac{5}{3}\right)}{2}-\dfrac{4}{5}=x+1\\ \Rightarrow\dfrac{3x-5}{2}-\dfrac{4}{5}=x+1\Rightarrow\dfrac{5\left(3x-5\right)}{10}-\dfrac{8}{10}=x+1\\ \Rightarrow\dfrac{15x-33}{10}=x+1\\ \Rightarrow\dfrac{15x-33}{10}-x=x+1\\ \Rightarrow\dfrac{15x-33}{10}=x+1-x\\ \Rightarrow5x-33=10\\ \Rightarrow5x=10+33\\\Rightarrow5x=43\\ \Rightarrow x=\dfrac{43}{5} \)
\(\dfrac{3}{2}\times\left(x-\dfrac{5}{3}\right)-\dfrac{4}{5}=x+1\)
\(\Leftrightarrow\dfrac{3}{2}\times x-\dfrac{5}{2}-\dfrac{4}{5}=x+1\)
\(\Leftrightarrow\dfrac{3}{2}\times x-x=1+\dfrac{5}{2}+\dfrac{4}{5}\)
\(\Leftrightarrow\dfrac{1}{2}\times x=\dfrac{43}{10}\)
\(\Leftrightarrow x=\dfrac{43}{10}\div\dfrac{1}{2}\)
\(\Leftrightarrow x=\dfrac{43}{5}\)
bài 1:
1) 20 - 2(x+4)= 4
2) 30 - [ 4(x-2)+ 15]= 3
3) 14 ⋮(2.x + 3)
4) (3x - 24).7 = 2.73
5) (x + 1)3 = 27
6) (2x - 6).47=49
7) (10 + 2x) : 42011 = 42013
8) [(8x - 12) :4].33 = 36
9) 6⋮(x - 1)
10) (x + 5)⋮(x + 2)
mong mn giúp mình gấp với ạ ^^
1: Ta có: \(20-2\left(x+4\right)=4\)
\(\Leftrightarrow2\left(x+4\right)=16\)
\(\Leftrightarrow x+4=8\)
hay x=4
5: Ta có: \(\left(x+1\right)^3=27\)
\(\Leftrightarrow x+1=3\)
hay x=2