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(2\(x-\dfrac{4}{3}\)): \(\dfrac{4}{15}\) - 75% = 9\(\dfrac{1}{4}\)
(2\(x\) - \(\dfrac{4}{3}\)) : \(\dfrac{4}{15}\) - 0,75 = 9,25
(2\(x\) - \(\dfrac{4}{3}\)): \(\dfrac{4}{15}\) = 9,25 + 0,75
(2\(x\) - \(\dfrac{4}{3}\)): \(\dfrac{4}{15}\) = 10
2\(x\) - \(\dfrac{4}{3}\) = 10 \(\times\) \(\dfrac{4}{15}\)
2\(x\) - \(\dfrac{4}{3}\) = \(\dfrac{8}{3}\)
2\(x\) = \(\dfrac{8}{3}\) + \(\dfrac{4}{3}\)
2\(x\) = \(\dfrac{12}{3}\)
2\(x\) = 4
\(x\) = 4:2
\(x\) = 2
\(\left(2x-\dfrac{4}{3}\right)\div\dfrac{4}{15}-75\%=9\dfrac{1}{4}\)
\(\left(2x-\dfrac{4}{3}\right)\div\dfrac{4}{15}-\dfrac{3}{4}=\dfrac{37}{4}\)
\(\left(2x-\dfrac{4}{3}\right)\div\dfrac{4}{15}=10\)
\(2x-\dfrac{4}{3}=\dfrac{8}{3}\)
\(2x=\dfrac{8}{3}+\dfrac{4}{3}\)
\(2x=4\)
\(x=2\)
tao là N nè kqua phần a ra 20/3, phần b là 2.5 còn phần c tao làm rồi nhưng không chắc
a, 7\(x\) - \(x\) = 521 : 519 + 3.22.7
6\(x\) = 53 + 3.4.7
6\(x\) = 125 + 12.7
6\(x\) = 125 + 84
6\(x\) = 209
\(x\) = 209 : 6
\(x\) = \(\dfrac{209}{6}\)
b; 11\(x\) - 7\(x\) + 34 : 33 = 54 + 2\(x\)
4\(x\) + 3 = 625 + 2\(x\)
4\(x\) - 2\(x\) = 625 - 3
2\(x\) = 622
\(x\) = 622 : 2
\(x\) = 311
c; 75 - 5.(\(x-3\))3 = 700
5.(\(x\) - 3)3 = 700 - 75
5.(\(x\) - 3)3 = - 625
(\(x\) - 30)3 = - 625 : 5
(\(x\) - 30)3 = - 125
(\(x-3\))3 = (-5)3
\(x\) - 3 = - 5
\(x\) = - 5 + 3
\(x\) = -2
d, 3.(2\(x\) - 1)2 = 75
(2\(x\) - 1)2 = 75 : 3
(2\(x\) - 1)2 = 25
\(\left[{}\begin{matrix}2x-1=-5\\2x-1=5\end{matrix}\right.\)
\(\left[{}\begin{matrix}2x=-5+1\\2x=5+1\end{matrix}\right.\)
\(\left[{}\begin{matrix}2x=-4\\2x=6\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-2\\x=3\end{matrix}\right.\)
a. 42 . 46 + 42 . 52
= 42 . (46+52)
= 16 . 98
= 1568
b. -75+58+(-25)
= [-75+(-25)]+58
= -100+58
= -42
c. -4 . 5 . (-25)
= [-4 . (-25)] . 5
= 100 . 5
= 500
Bài 1:
a) =25,97+(6,54+103,46)
=25,97+110
=135,97
b)136x75+75x64
=75x(136+64)
=75x200
=15 000
c) (21/8+1/2):5/16
=(21/8+4/8)x16/5
=25/8x16/5
=10
d)3/17-4/5+14/17
=(3/17+14/17)-4/5
=1-4/5
=1/5
Bài 2:
a)720:\([41-(2x-5)]\)=120
41 - (2x-5) =720:120
41 - (2x-5) =6
2x-5 =41-6
2x-5 =35
2x =35+5
2x =40
x =40:2
x =20
b)2/3 x X +3/4=3
2/3 x X =3-3/4
2/3 x X =12/4-3/4
2/3 x X =9/4
x =9/4:2/3
x =9/4x3/2
x =27/8
c) x+0,34=1,19x1,02
x+0,34=1,2138
x =1,2138-0,34
x =0,8738
(-1).(-1)\(^2\).(-1)\(^3\).....(-1)\(^{100}\)
\(\Rightarrow\)(-1).1.(-1).1.....(-1).1
có tất cả 50 số -1
có tất cả 50 số 1
\(\Rightarrow\) \([\)(-1).50\(]\).\([\)1.50\(]\)
=-50.50=0
\(\left(2x-1\right)+\dfrac{1}{4}=75\%\)
\(\left(2x-1\right)+\dfrac{1}{4}=\dfrac{3}{4}\)
\(2x-1=\dfrac{3}{4}-\dfrac{1}{4}\)
\(2x-1=\dfrac{2}{4}\)
\(2x-1=\dfrac{1}{2}\)
\(2x=\dfrac{1}{2}+1\)
\(2x=\dfrac{1}{2}+\dfrac{2}{2}\)
\(2x=\dfrac{3}{2}\)
\(x=\dfrac{3}{2}:2\)
\(x=\dfrac{3}{2}.\dfrac{1}{2}\)
\(x=\dfrac{3}{4}\)
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