( x e n / x + 1 < 10) ngoac nhọn chứ không phải ngoac tròn nha moi người
( x e n/ 7 < x + 1 < 13 ) ngoac nhọn chứ hk phải ngoac tròn do em hk bit bấm ngoac nhon mong moi người thông cảm dùm ạ
( x e n/ 7< x + 1<13) ngoac nhọn nha moi nguoi
75x(-21)=..........x ngoac vuong (........)+(-1)ngoac vuong=........x(.......)+........x(........)
=............+(............)=........................
75x(-21)
=75x[(-20)+(-1)]
=75x(-20)+75x(-1)
=-1500+-75
=-1575
|x| - mo ngoac 5x - 207 donh ngoac = - 5x - mo ngoac - 307 dong ngoac
2 mo ngoac x cong 1 dong ngoac tru 1 bang 3
\(2\left(x+1\right)-1=3\\ 2\left(x+1\right)=4\\ x+1=2\\ x=1\)
\(2\left(x+1\right)-1=3\)
\(2\left(x+1\right)=3+1\)
\(2\left(x+1\right)=4\)
\(x+1=4:2\)
\(x+1=2\)
\(x=2-1\)
\(x=1\)
\(2\left(x+1\right)-1=3\)
\(2x+2-1=3\)
\(2x=3+1-2=2\)
\(x=2:2\)
\(x=1\)
tim X biet
a(3x(X+2):7)x4=120
b2480-720:3+(200-(X+5))=1010
x là nhân
ngoac dung truoc la ngoac lon
giai chi tiết nha
a)[ 3 x ( x + 2 ) : 7 ] x 4 = 120
[ 3 x ( x + 2 ) : 7 ] = 120 : 4
[ 3 x ( x + 2 ) : 7 ] = 30
3 x ( x + 2 ) = 30 x 7.
3 x ( x + 2 ) = 210
( x + 2 ) = 210 : 3
( x + 2 ) = 70
=>x = 70 ‐ 2
x =68
b) 2480 - 720 : 3 + [200 - (x - 5)] = 1010
<=>2240 + 200 - (x-5) =1010
<=> -x+5 =-1430
<=> -x = -1435
<=> x =1435
NHỚ TK MK NHA
a)[ 3 x ( x + 2 ) : 7 ] x 4 = 120
[ 3 x ( x + 2 ) : 7 ] = 120 : 4
[ 3 x ( x + 2 ) : 7 ] = 30
3 x ( x + 2 ) = 30 x 7.
3 x ( x + 2 ) = 210
( x + 2 ) = 210 : 3
( x + 2 ) = 70
=>x = 70 ‐ 2
x =68
b) 2480 - 720 : 3 + [200 - (x - 5)] = 1010
<=>2240 + 200 - (x-5) =1010
<=> -x+5 =-1430
<=> -x = -1435
<=> x =1435
NHỚ TK MK NHA
240 - dong ngoac vuong 23 + ( 13 + 24 .3 - x)dong ngoac vuong =132.
240 - [ 23 + ( 13 + 24 . 3 - x ) ] = 132
240 - [ 23 + 13 + 72 - x ] = 132
240 - 23 - 13 - 72 + x = 132
132 + x = 132
x = 132 - 132
x = 0
Vậy x = 0
=))
\(240-\left[23+\left(13+24.3-x\right)\right]=132\)
\(23+\left(13+24.3-x\right)=240-132\)
\(23+\left(13+24.3-x\right)=108\)
\(13+24.3-x=108-23\)
\(13+24.3-x=85\)
\(24.3-x=85-13\)
\(24.3-x=72\)
\(72-x=72\)
\(x=72-72\)
\(x=0\)
(144-97)-144
Giúp minh nha
Bài nay phải bỏ ngoac
(144-97)-144
=144-97-144
=(144-144)-97
=0-97
=-97
(144-97)-144
=144-97-144
=144-144-97
=0-97
= -97
Bài làm
( 144 - 97 ) - 144
= 144 - 97 - 144
= ( 144 - 144 ) - 97
= -97
-ngoac a-b cong c dong ngoac - ngoAC a cong b cong c
\(\left(a-b+c\right)-\left(a+b+c\right)\)
=a - b + c - a -b -c =-2b