x-6=1511+1206
x - 681 = 1511 + 1206
x - 681 = 1511 + 1206
x - 681 = 2717
x = 2717 + 681
x = 3398
Tìm x biết
a ) x − 1 2 = 7 13 . 13 28 b ) x 15 = − 3 11 . 77 36 ; c ) x + 7 7 = 9 18 . 9 27 d ) x : 15 11 = − 3 12 .8
a ) x − 1 2 = 7 13 . 13 28 ; x − 1 2 = 1 4 b ) x 15 = − 3 11 . 77 36 ; x 15 = − 7 12 ; x = 15. − 7 12 c ) x + 7 7 = 9 18 . 9 27 ; x + 1 = 1 6 d ) x : 15 11 = − 3 12 .8 ; x : 15 11 = − 2 ; x = ( − 2 ) . 15 11
Tim x :
1206:x+342:x=6
24nhan x - 15 nhan x =1980
1206 : x + 342 : x = 6 24 x X - 15 x X = 1980
=> ( 1206 + 342 ) : x = 6 => ( 24 - 15 ) x X = 1980
=> 1548 : x = 6 => 9 x X = 1980
=> x = 1548 : 6 => x = 1980 : 9
=> x = 258 => x = 220
*** ủng hộ mik nha bạn !!!
a)1206/x+342/x=6
1206*1/x+342*1/x=6
(1206+342)*1/x=6
1548*1/x=6
1/x=1548/6
1/x=258
x=1/258
b)24*x-15*x=1980
(24-15)*x=1980
9*x=1980
x=1980/9
x=220
5) (x– 5)(x – 1)= (x – 1)(x – 2)
6) 6(х - 3)(х — 4) - 6х(х — 2) = 4
7)-(x + 3)(x – 4) + (x + 1)(x – 1) = 10
8) (2x – 1)(x – 2) – (x + 3)(2x – 7) =3
9) (х - 5)(4 — х) — (х — 1)(х + 3) = -2x^2
10 (4x + 1)(x – 3) - (x- 7)(4x – 1)=15
11) (x + 1)(x² – x + 1) – x(x² – 3) = 4
12) (x – 3)(x² + 3x+9)+ x(5 – x²?) = 6x
13) (3x – 5)(x + 1)– (3x – 1)(x+ 1)=x - 4
14) 5(x – 3)(x – 7)– (5x+ 1)(x – 2)= 8
Tìm x :
a) 1206 : X + 342 : X = 6
b) 24 x X - 15 x X = 1980
hộ mình nha các bạn iu các bạn nhìu
1511
a)3/7x=8/13y=6/19z và 2x-y-z =-6
b)x/8=y/3=7/10 va xy+yz+zx=1206
c) x/4=2y/5=5z/6 và x2- 3y2+2z2=325
a) \(\frac{3}{7}x=\frac{8}{13}y=\frac{6}{19}z\) và 2x-y-z =-6
=)\(\frac{x}{\frac{7}{3}}=\frac{y}{\frac{13}{8}}=\frac{z}{\frac{19}{6}}=\frac{2x}{\frac{14}{3}}=\frac{y}{\frac{13}{8}}=\frac{z}{\frac{19}{6}}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có:
\(\frac{2x}{\frac{14}{3}}=\frac{y}{\frac{13}{8}}=\frac{z}{\frac{19}{6}}=\frac{2x-y-z}{\frac{14}{3}-\frac{13}{8}-\frac{19}{6}}=\frac{-6}{\frac{-3}{24}}=48\)
\(\Rightarrow\frac{x}{\frac{7}{3}}=48\Rightarrow x=48\times\frac{7}{3}=112\)
\(\Rightarrow\frac{y}{\frac{13}{8}}=48\Rightarrow y=48\times\frac{13}{8}=78\)
\(\Rightarrow\frac{z}{\frac{19}{6}}=48\Rightarrow z=48\times\frac{19}{6}=152\)
Vậy x=112;y=78;z=152
1206 x 1317 = bn??
Đặt tính rồi tính:
2308 x 3
1206 x 5