( x+2 ) + ( x+4 ) + ( x+6 )+...+( x+196 ) = 99800
tìm X:
2.5x25/x=5/6
(x+2)+(x+4)+......+(x+1996)=99800
( x + 2 ) + ( x + 4 ) + .. + ( x + 1996 ) = 998000
<=> ( x + x + ... + x ) + ( 2 + 4 + ... + 1996 ) = 998000
<=> 998x + 997002 = 998000
<=> 998x = 998000 - 997002
<=> 998x = 998
<=> x = 998 : 998
<=> x = 1
(x+2)+(x+4)+.....+(x+1996)=99800
(x+x+...+x)+(2+4+....+1996)=99800
998x + 997002 =99800
998x =99800-997002
998x =-897202
x =-897202:998
x =899
Tìm x biết (x+2)+(x+4)+......+(x+1996)=99800
(x+2)+(x+4)+......+(x+1996)=998000
x+2+x+4+.....+x+1996=998000
x+x+...+x+2+4+....+1996=998000
x*998+(1996+2)*998:2=998000
x*998+997002=998000
x*998=998000-997002
x*998=998
x=998:998
x=1
(x+2)+(x+4)+....+(x+1996) = 99800
(2 +4 + ...+1996) + ( x + x + ...+ x) =99800
997002 + x * 998 = 99800
x * 998 =99800-997002
x * 998 = 998
x = 998 : 998
x =1
(50- 3 x X ) : 4 x2 -30 : 2 +2 x 7 =21
A = 33...3/50 chữ số 3 x 99...9/50 chữ số 9
( X + 2 ) + ( X+ 4) + ... + (X + 1996) = 99800
(x+2)+(x+4)+...+(x+1996) = 99800
=> (x+x+x+...+x)+(2+4+...+1996) = 99800
=> 998x + 997002 = 99800
998x = 99800 - 997002
998x = -897202
x = -897202 : 998
x = -899
1.Tìm số nguyên x,biết:
a) 5(x-2)-3x=-4
b) (x-3).(x+4)<0
2.Tính:
(196-12).(196-22).(196-32)........(196-252)
1.Tìm số nguyên x,biết:
a) 5(x - 2) - 3x = -4
=> 5x - 5 . 2 - 3x = -4
=> 5x - 10 - 3x = -4
=> (5x - 3x) - 10 = -4
=> 2x - 10 = -4
=> 2x = -4 + 10
=> 2x = 6
=> x = 6 : 2
=> x = 3
b) (x - 3) . (x + 4) < 0
=> \(\left[\begin{matrix}x-3=0\\x+4=0\end{matrix}\right.=>\left[\begin{matrix}x=0+3\\x=0-4\end{matrix}\right.=>\left[\begin{matrix}x=3\\x=-4\end{matrix}\right.\)
=> -4 < x < 3
1.Tìm số nguyên x,biết:
a) 5(x-2)-3x=-4
b) (x-3).(x+4)<0
2.Tính:
(196-12).(196-22).(196-32)........(196-252)
GIÚP MÌNH VỚI,MÌNH GẤP LẮM.
1a,5(x-2)-3x=4
5x-10-3x=4
2x-10=4
2x=4+10
2x=14
x=7
1a,5.(x-2)-3x=-4
5x-10-3x=-4
2x-10=-4
2x= -4+10
2x=6
x=3
a) 4 756+9xX=8 788 b)X-176-242=357
9xX=8 788-4 756 X-176 =357+242
9xX=4 032 X-176 =599
X=4 032:9 X =599+176
X=448 X =775
C)X:2:3=150 D)Xx6+160=196
X:2 =150x3 Xx6 =196-160
X:2 =450 Xx6 =36
X 450x2 X =36:6
X =900 X =6
K CHO TÔI NHA
thank you bạn Đặng Hà Anh
a) 6/11*x=9/2*x=18/5*z và -x+z=-196
b) x-1/2=y+3/4=z-5/6 và x+y+z=10
Giúp mk với. mk đang cần gấp!!
Câu 1. Tính theo cách thuận tiện nhất:
25 x 96 x 4 x 2 ...................................................................................................................................................... 155 x 42 + 155 x 58 .................................................................................................................................................... 461 x 35 + 35 x 539 196 x 73 + 196 x 27 ...................................................................................................................................................... .....................................................................................................................................................
1.
=(25x4)x(96x2)
=100x192=19200
2.
=155x(42+58)
=155x100=1500
3.
=35x(461+539)
=35x1000=35000
4
=196x(73+27)
=196x100=19600
ủa ;-;
sao ko cách dòng dc ta
Bài 4: Sao tìm được n khi chỉ cho 1 vế
Bài 6:
\(\left(2x-3\right)^2=\dfrac{196}{225}=\left(\dfrac{14}{15}\right)^2=\left(-\dfrac{14}{15}\right)^2\\ \Leftrightarrow\left[{}\begin{matrix}2x-3=\dfrac{14}{15}\\2x-3=-\dfrac{14}{15}\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}2x=\dfrac{14}{15}+3=\dfrac{59}{15}\\2x=\dfrac{-14}{15}+3=-\dfrac{31}{15}\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{59}{15}:2=\dfrac{59}{30}\\x=-\dfrac{31}{15}:2=-\dfrac{31}{30}\end{matrix}\right.\)