X*7=324+x
324-(7.x-18).5=99
324 - (7.x - 18) . 5 = 99
7x - 18 . 5 = 324 - 99
7x - 18 . 5 = 225
7x - 18 = 225 : 5
7x - 18 = 45
7x = 45 + 18
7x = 63
x = 9
324 - ( 7. x -18) . 5= 99
( 7. x - 18) . 5= 324 - 99
( 7. x - 18 ) .5= 225
7. x -18 = 225 : 5
7 . x -180 = 45
7 . x = 45 + 18
7 . x =63
x = 63 : 7
x = 9
Vay x = 9
Tính giá trị biểu thức:
296 x 7 + 324 : 3
A= 2004 x 37 + 2004 + 2 x 2004 + 2004 x 59 + 2004
324 x 321 - 201 x 324 - 324 x 101 - 18 x 324
\(\frac{x-5}{325}+\frac{x-6}{324}=\frac{x-7}{323}+\frac{x-8}{322}\)
\(\Leftrightarrow\frac{x-5}{325}-1+\frac{x-6}{324}-1=\frac{x-7}{323}-1+\frac{x-8}{322}-1\)
\(\Leftrightarrow\frac{x-330}{325}+\frac{x-330}{324}-\frac{x-330}{323}-\frac{x-330}{322}=0\)
\(\Leftrightarrow\left(x-330\right)\left(\frac{1}{325}+\frac{1}{324}-\frac{1}{323}-\frac{1}{322}\right)=0\)
Ma \(\frac{1}{325}+\frac{1}{324}-\frac{1}{323}-\frac{1}{322}\ne0\)
\(\Rightarrow x-330=0\)
\(\Rightarrow x=330\)
\(\frac{x-5}{325}+\frac{x-6}{324}=\frac{x-7}{323}+\frac{x-8}{322}\)
\(\Leftrightarrow\left[\frac{x-5}{325}-1\right]+\left[\frac{x-6}{324}-1\right]=\left[\frac{x-7}{323}-1\right]+\left[\frac{x-8}{322}-1\right]\)
\(\Leftrightarrow\frac{x-5-325}{325}+\frac{x-6-324}{324}=\frac{x-7-323}{323}+\frac{x-8-322}{322}\)
\(\Leftrightarrow\frac{x-330}{325}+\frac{x-330}{324}=\frac{x-330}{324}+\frac{x-330}{332}\)
\(\Leftrightarrow\frac{x-330}{325}+\frac{x-330}{324}=\frac{x-330}{324}+\frac{x-330}{332}=0\)
Auto làm nốt :v
tính nhanh:
324 x 20 + 80 x 324 + 324 x 0
= 324 x ( 20+80+0)
=324 x 100
=32 400
324 x 20 + 80 x 324 + 324 x 0
= 324 x (20 + 80 + 0 )
=324 x 100
= 32400
324 x 20 + 80 x 324 + 324 x 0
= 324 x (20 + 80 + 0 )
= 324 x 100
= 32400
Tìm x biết
a,x+2/327+x+3/326+x+4/325+x+5/324+x+349/5=0
b,|5x-3|>=7
Tìm x biết
a,x+2/327+x+3/326+x+4/325+x+5/324+x+349/5=0
b,|5x-3|>=7
tìm x:x x 7=324+x
các bn giải chi tiết giúp mình nha
324:6= 54
sao lại =57 ?
\(x\times7=324+x\)
\(x\times7-x=324\)
\(x\times\left(7-1\right)=324\)
\(x\times6=324\)
\(x=324:6\)
\(x=57\)
x x 7=324+x
X x 7 - X =324
X x (7-1)=324
X x 6 =324
X=324:6
X=54
HT
tính nhanh (324 x 6 + 4 x 324 ) : (162 x 2)
(324 x 6 + 4 x 324 ) : (162 x 2)
= 324 x (6+4) : 324
= 324 x 10 : 324
= (324:324) x 10
= 1 x 10
= 10
\(\text{(324 x 6 + 4 x 324 ) : (162 x 2)}.\)
\(=\left[\left(6+4\right)\times324\right]:324.\\ =\left(10\times324\right):324.\\ =10.\)