a x 6 -a x 2 - a = 24
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
PT
1
CM
31 tháng 7 2018
a) 24 : 6 : 2 = 4 : 2 = 2 => Đ
b) 24 : 6 : 2 = 24 : 3 = 8 => S
c) 18 : 3 x 2 = 18 : 6 = 3 => S
d) 18 : 3 x 2 = 6 x 2 = 12 => Đ
YN
5
22 tháng 2 2017
a x 2 + a x 4 + a x 6 = 24 x 10
a x 12 = 240
a = 240 / 12
a = 20 tk mk nha!
22 tháng 2 2017
a x 2 + a x 4 + a x 6 = 24 x 10
a x 2 + a x 4 + a x 6 = 240
a x ( 2 + 4 + 6 ) = 240
a x 12 = 240
a = 240 : 12
a = 20
Vậy a = 20
NT
1
13 tháng 8 2015
a) x2 + 2x - 3x - 6 = x(x + 2) - 3(x + 2) = (x + 2)(x - 3)
b) a2 - 4b2 = (a - 2b)(a + 2b)
c) x2 + 6x - x - 6 = x(x + 6) - (x + 6) = (x + 6)(x - 1)
d) x2 + 6x + 4x + 24 = x(x + 6) + 4(x + 6) = (x + 6)(x + 4)
e) x2 - 8x + 3x - 24 = x(x - 8) + 3(x - 8) = (x - 8)(x + 3)
TT
1
Q
3
12 tháng 11 2021
a) ĐKXĐ: \(x\ne-5\)
\(\Leftrightarrow7x-7=6x+30\\ \Leftrightarrow x=37\)
b) \(\Leftrightarrow25x^2=144\\ \Leftrightarrow x^2=\dfrac{144}{25}\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{12}{5}\\x=-\dfrac{12}{5}\end{matrix}\right.\)
18 tháng 5 2016
bài 1
a, 432 x 25 + 46 x 432 - 432
= 432 x ( 25 + 46 - 1)
=432 x 70
=30 240
b, 432 : 6 - 232 : 6 + 102 : 6
=(432 - 232 +102) : 6
=302:6
=50,333333333333..................
bài 2
a, 285 * x + 115 * x = 400
(285 + 115) * x = 400
400 * x = 400
x = 400 : 400
x = 1
b, x - 6 : 2 - (48 - 24 x 2 : 6 - 3) = 0
x - 3 - (48 - 48 : 6 - 3) = 0
x - 3 - ( 48 - 8 - 3) = 0
x - 3 - 37 = 0
x - 3 = 0 + 37
x - 3 =37
x = 37 + 3
x = 40
18 tháng 5 2016
a) 432x25+46x432-432
=10800+19872-432
=30240
ban oi cau b sai đề hay gì đó
VT
18 tháng 12 2022
\(a,468:6+51\times2\\ =78+102\\ =180\\ b,\left(15\times24\right):4\\ =360:4\\ =90\)
NK
18 tháng 12 2022
\(a,468:6+51\times2=78+102=180\)
\(b,\left(15\times24\right):4=360:4=90\)
7 tháng 7 2023
Bài 1
a) \(5\times72\times10\times2=\left(5\times2\times10\right)\times72=100\times72=7200\)
b) \(40\times125=5\times\left(8\times125\right)=5\times1000=5000\)
c) \(16\times6\times25=4\times4\times6\times25=\left(4\times6\right)\times\left(4\times25\right)=24\times100=2400\) Bài 2:
a) \(24\times57+43\times24=24\times\left(57+43\right)=24\times100=2400\)
b) \(12\times19+80\times12+12=12\times\left(19+80+1\right)=12\times100=1200\)
c) \(\left(36\times15\times169\right)\div\left(5\times18\times13\right)\)
\(=\left(18\times2\times3\times5\times13\times13\right)\div\left(5\times18\times13\right)\)
\(=\left(2\times3\times13\right)\times\left(18\times5\times13\right)\div\left(5\times18\times13\right)\)
\(=2\times3\times13\)
\(=78\)
d) \(\left(44\times52\times60\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times11\times4\times13\times4\times15\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times4\times4\right)\times\left(11\times13\times15\right)\div\left(11\times13\times15\right)\)
\(=4\times4\times4\)
\(=64\)
Bài 3:
a) \(x-280\div35=5\times54\)
\(x-8=270\)
\(x=270+8\)
\(x=278\)
b) \(\left(x-280\right)\div35=54\div4\)
\(\left(x-280\right)\div35=\dfrac{27}{2}\)
\(x-280=\dfrac{27}{2}\times35\)
\(x-280=\dfrac{945}{2}\)
\(x=\dfrac{945}{2}+280\)
\(x=\dfrac{1505}{2}\)
c) \(\left(x-128+20\right)\div192=0\)
\(x-128+20=0\times192\)
\(x-128+20=0\)
\(x-128=0-20\)
\(x-128=-20\)
\(x=-20+128\)
\(x=108\)
d) \(4\times\left(x+200\right)=460+85\times4\)
\(4\times\left(x+200\right)=460+340\)
\(4\times\left(x+200\right)=800\)
\(x+200=800\div4\)
\(x+200=200\)
\(x=200-200\)
\(x=0\)
Bài 4:
a) \(\dfrac{7}{12}-\dfrac{5}{12}=\dfrac{2}{12}=\dfrac{1}{6}\)
b) \(\dfrac{8}{11}+\dfrac{19}{11}=\dfrac{27}{11}\)
c) \(\dfrac{3}{8}+\dfrac{5}{12}=\dfrac{9}{24}+\dfrac{10}{24}=\dfrac{19}{24}\)
d) \(\dfrac{3}{4}+\dfrac{7}{12}=\dfrac{9}{12}+\dfrac{7}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)
Bài 5:
a) \(x-\dfrac{6}{7}=\dfrac{5}{2}\)
\(x=\dfrac{5}{2}+\dfrac{6}{7}\)
\(x=\dfrac{47}{14}\)
b) \(\dfrac{12}{7}\div x+\dfrac{2}{3}=\dfrac{7}{5}\)
\(\dfrac{12}{7}\div x=\dfrac{7}{5}-\dfrac{2}{3}\)
\(\dfrac{12}{7}\div x=\dfrac{11}{15}\)
\(x=\dfrac{12}{7}\div\dfrac{11}{15}\)
\(x=\dfrac{180}{77}\)
\(4a-a=24\Leftrightarrow3a=24\Leftrightarrow a=8\)
.