4.( x-3)-7.7=1
9.(x+4)-25=5.4
nhanh giúp mik vs
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
KO
2
28 tháng 4 2017
9+3.(-5)=9+(-15)= -6
\(\frac{-2}{15}\)-\(\frac{4}{25}\)= \(\frac{-10}{75}\)-\(\frac{12}{75}\)= \(\frac{-22}{75}\)
\(\frac{-3}{5}\). \(\frac{4}{11}\)+\(\frac{-3}{7}\). \(\frac{7}{11}\)+ \(\frac{-3}{7}\)= \(\frac{-12}{55}\)+ \(\frac{-21}{77}\)+ \(\frac{-3}{7}\)
= \(\frac{-84}{385}\)+\(\frac{-105}{385}\)+\(\frac{-165}{385}\)
= \(\frac{-354}{385}\)
28 tháng 4 2017
a) 9+3.(-5) =9-15=-6
b) \(\frac{-2}{15}-\frac{4}{25}=\frac{-2.5}{75}-\frac{4.3}{75}=\frac{-10-12}{75}=\frac{-22}{75}\)
c) \(\frac{-3}{5}.\frac{4}{11}+\frac{-3}{7}.\frac{7}{11}+\frac{-3}{7}=\frac{-12}{55}+\frac{-21}{77}+\frac{-3}{7}=\frac{-12.7}{385}+\frac{-21.5}{385}+\frac{-21.55}{385}=\frac{-84-105-1155}{385}=\frac{-1344}{385}=\frac{-192}{5}\)
hi! hi! hk bit dug hk :)
AN
5
12 tháng 7 2021
m) \(\dfrac{1}{4}x^2-4x^2=\left(\dfrac{1}{2}x-2x\right)\left(\dfrac{1}{2}x+2x\right)\)
n) \(\dfrac{4}{49}-4x^2=\left(\dfrac{2}{7}-2x\right)\left(\dfrac{2}{7}+2x\right)\)
o) \(\left(x-3\right)\left(x+3\right)=x^2-9\)
8 tháng 5 2018
a, | x - 3/4 | = 1/2
=>\(\orbr{\begin{cases}x-\frac{3}{4}=\frac{1}{2}\\x-\frac{3}{4}=-\frac{1}{2}\end{cases}}\)
=>\(\orbr{\begin{cases}x=\frac{1}{2}+\frac{3}{4}\\x=-\frac{1}{2}+\frac{3}{4}\end{cases}}\)
=>\(\orbr{\begin{cases}x=\frac{2}{4}+\frac{3}{4}\\x=-\frac{2}{4}+\frac{3}{4}\end{cases}}\)
=>\(\orbr{\begin{cases}x=\frac{5}{4}\\x=\frac{1}{4}\end{cases}}\)
Vậy....
VP
8 tháng 5 2018
a) \(|x-\frac{3}{4}|=\frac{1}{2}\)
\(< =>\orbr{\begin{cases}x-\frac{3}{4}=\frac{1}{2}\\x-\frac{3}{4}=-\frac{1}{2}\end{cases}}\)
\(< =>\orbr{\begin{cases}x=\frac{1}{2}+\frac{3}{4}\\x=-\frac{1}{2}+\frac{3}{4}\end{cases}}\)
\(< =>\orbr{\begin{cases}x=\frac{5}{4}\\x=\frac{1}{4}\end{cases}}\)
Vay : x = 5/4 hoặc x = 1/4
b)\(saide\)
26 tháng 6 2018
\(9\left(x+4\right)-25=5\cdot4\)
\(9\left(x+4\right)=20+25\)
\(9\left(x+4\right)=45\)
\(x+4=\frac{45}{9}\)
\(x+4=5\)
\(x=5-4\)
\(x=1\)
26 tháng 6 2018
\(9.\left(x+4\right)-25=5.4\)
\(9x+9.4=20+25\)
\(9x+36=45\)
\(9x=45-36\)
\(9x=9\)
\(x=9:9\)
\(x=1\)
Vậy \(x=1\)
19 tháng 3 2023
= 51/20
----------------------------------
= 3/14
------------------------------------
= 4/7 - 2/7
= 2/7
--------------------------------------
= 17/45
---------------------------------------
= 2/3
--------------------------------------
= 2 x 1/4
= 1/2
19 tháng 3 2023
5/9xx6/15=30/135=2/9
4/7:24/5=4/7xx5/24=5/42
6/11:4=6/11xx1/4=3/22
12xx19/18=12/1xx19/18=38/3
15 : 25/4=15/1xx4/25=12/5
1212/1515:2727/2525=1212/1515xx2525/2727=20/27
14/27 : 7/18 x 6/5+3/10=14/27xx18/7xx6/5+3/10=4/3xx6/5+3/10=8/5+3/10=16/10+3/10=19/10
`4.(x-3)-7.7=1`
`4.(x-3)-49=1`
`4.(x-3)=1+49=50`
`x-3=50:4=25/2`
`x=25/2+3=31/2`
_____________________________________________________
`9.(x+4)-25=5.4`
`9.(x+4)-25=20`
`9.(x+4)=20+25=45`
`x+4=45:9=5`
`x=5-4=1`
\(4.\left(x-3\right)-7.7=1\)
\(4.\left(x-3\right)-49=1\)
\(4.\left(x-3\right)=1+49\)
\(4.\left(x-3\right)=50\)
\(\left(x-3\right)=50\div4\)
\(x-3=12,5\)
\(x=12,5+3\)
\(x=15,5\)
\(9.\left(x+4\right)-25=5.4\)
\(9.\left(x+4\right)-25=20\)
\(9.\left(x+4\right)=20+25\)
\(9.\left(x+4\right)=45\)
\(\left(x+4\right)=45\div9\)
\(x+4=5\)
\(x=5-4\)
\(x=1\)