Tính
A, 34+(9-21)=3417-(x+3417)
B, (15-x)+(x-21)=7-(-8+x)
Tìm x:
A. 34 + (9 - 21)= 3417 - (x + 3417)
B. (15 - x) + (x - 12)= 7 - (-8 - x)
\(b,\left(15-x\right)+\left(x-12\right)=7-\left(-8-x\right)\)
\(\Leftrightarrow15-x+x-12=7+8+x\)
\(\Leftrightarrow3=15+x\)
\(\Leftrightarrow x=3-15\)
\(\Leftrightarrow x=-12\)
Vậy : \(x=-12\)
Mik sửa lại câu a cho bạn Đạt này
A. 34 + (9 - 21)= 3417 - (x + 3417)
<=>34 + (-12) = 3417 - x - 3417
<=>22 = -x
=> x = -22
Vậy x= -22
\(a,34+\left(9-21\right)=3417-\left(x+3417\right)\)
\(\Leftrightarrow34+13=3417-x-3417\)
\(\Leftrightarrow47=-x\)
\(\Leftrightarrow x=-47\)
Vậy : \(x=-47\)
34 + ( 9-21) = 3417 - ( x + 3417)
34+(9-21)=3417-(x+3417)
34+(-12)=3417-3417+x
22=0+x
22=x
Vậy x=22
34+(9-21)=3417-(x+3417)
34+(-12)=3417-(x+3417)
22 =3417-(x+3417)
3417-22=x+3417
3395 =x+3417
3395-3417=x
x=-22
34 + (9 -21) = 3417 - ( x +3417)
34 + ( 9 - 21 ) = 3417 - ( x + 3417 )
34 + ( -12 ) = 3417 - x - 3417
46 = x
=> x = 46
34 + ( 9 - 21 ) = 3417 - ( x + 3417 )
34 + ( -12 ) = 3417 - x - 3417
46 = x
=> x = 46
34+(9-21)=3417-(x+3417)
x-{55-[49+(-28-x)]}=13-{47[25-(32-x)]}
B)x-55+49+(-28-x)=13-47-25+(32-x)-34=-27-x=>x=34-27=7
TICH NHA LAN ANH !!!!( k chep de bai dau !!! )
tìm x \(\in\)Z biết
a) 34+(9-21)=3417-(x+341)
b)(15-x)+(x-12)=7-(-8+x
c) x-{55-[49+(-28-x)]}=13-{47+[25-(32-x)]}
d) -7+lx+4l=-3
e) lx-10l-(-12)=4
34 + (9-21)=3417-(x+341)
22 = 3417-(x+341)
3417-(x+341)=22
x+341=3417-22
x+341=3395
x=3395-341 ; x =3054
Xin lỗi Quảng Bùi Quỳnh Trang, tớ lỡ bấm vào sai rồi
I'm sorry
lx-10l-(-12)=4
=lx-10l+12=4
=x-10 =4-12
=lx-10l =-8
cha ! tiep theo minh tac ti rui .Phan truoc khong biet dung khong
Tìm x thuộc Z biết :
A) 34+(9-21)=3417-(x+3417) B) x-(55-(49+(-28-x)))=13-(47+-25-32-x))
C)|x-1|-x+1=0 D) |2-x|+2=x
Giải ra giup minh nha !!!! MINH TICH CHO !!!!!
A) 34 + ( 9 - 21 ) = 3417 - (0 + 3417)
B) 9 - ( 55 - ( 49 + (-28 - 5 ))) = 13 -( 47 + -25 - 32 - 8 ))
C) |-1 - 1| - 1 + 1 = 0
D) |2 - 2| + 2 = 2
Tìm x thuộc Z, biết:
a. 1 + \(\left\{-2-[-3+\left(-4+\left|x\right|\right)]\right\}=1-2+[\left(-3-4\right)]\)
b. 34 + (9 - 21) = 3417 - (x + 3417)
c. x - \(\left\{55-[49+\left(-28-x\right)]\right\}=13-\left\{47+[25-\left(32-x\right)]\right\}\)
d. (15 - x) + (x - 12) = 7 - (-8 + x)
e. - 7 + \(\left|x-4\right|\) = - 3
f. 13 - \(|\)x + 5\(|\) = 13
g. \(|\)x + 1\(|\) > 2
h. \(|\)x + 2\(|\) ≤ 5
i. \(|\)x - 10\(|\) - (-12) = 4
Tính Nhanh:
a) 5/12*4/9+4/9*7/12 b) (13/21*7/8-12/21*7/8)*12 c) 7/11+3/4+4/11+8/17+1/4+18/34
Tìm x:
a) 3,71+(632-x)=415
b) 140:(5*x-15)=4
c) 84:(324:18+36-x)+15=19
a \(\dfrac{5}{12}\times\dfrac{4}{9}\) + \(\dfrac{4}{9}\times\dfrac{7}{12}\)
= \(\dfrac{4}{9}\times\left(\dfrac{5}{12}+\dfrac{7}{12}\right)\)
= \(\dfrac{4}{9}\times\dfrac{12}{12}\)
= \(\dfrac{4}{9}\)
b(\(\dfrac{13}{21}\times\dfrac{7}{8}-\dfrac{12}{21}\times\dfrac{7}{8}\)) x 12
(\(\dfrac{7}{8}\times\left(\dfrac{13}{21}-\dfrac{12}{21}\right)\))x 12
\(\dfrac{7}{8}\times\dfrac{1}{21}\) x 12
\(\dfrac{139}{14}\)
\(\dfrac{7}{11}+\dfrac{3}{4}+\dfrac{4}{11}+\dfrac{8}{17}+\dfrac{1}{4}+\dfrac{18}{34}\)
=\(\left(\dfrac{7}{11}+\dfrac{4}{11}\right)+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)\) + \(\dfrac{18}{34}\)
=1 + 1 + \(\dfrac{18}{34}\)
=\(\dfrac{34}{17}\)
2)a 3,71 + (632 - x) = 415
632 - x= 415 - 3,71
632 -x = 411,59
x = 632 - 411,59
x = 220,41
b, 140 : (5x \(x\) - 15) = 4
5x \(x\) - 15 = 140 : 4
5x \(x\) - 15 = 35
5x \(x\) = 35 + 15
5x \(x\) = 50
\(x\) = 50 : 5
\(x\) = 10
1.Thực hiện phép tính hợp lý nếu có thể
a) x - (11 - 1) = -48 + (-12 + x)
b) 34 + (9 - 21) = 3471 = (x + 3471)
c) (15 - x ) + ( x - 12 ) = 7 - (-8 + x)