1,8 (3) . X-3=-1/2
X : 2 + X x 1/3 + X x 1/6 = 1,8
\(x:2+x.\frac{1}{3}+x.\frac{1}{6}=1,8\)
\(x.\frac{1}{2}+x.\frac{1}{3}+x.\frac{1}{6}=1,8\)
\(x.\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}\right)=1,8\)
\(x.\left(\frac{3}{6}+\frac{2}{6}+\frac{1}{6}\right)=1,8\)
\(x.1=1,8\)
\(x=1,8\)
Vậy \(x=1,8\)
vậy 2 phần chia ra được 1 phần vậy =1/2
X x 1/2 +X x 1/3 +X x 1/6 =1,8
X x (1/2+1/3+1/6) =1,8
X x 1=1,8
X =1,8:1
X=1,8
Tính :căn bậc 2 của 1^3+2^3+3^3 - căn bậc hai của 1,8 x 3,2
(2/3 + 1/2) x 9/4 : 2
( 2,8 + 1,8) x 0,5:2
\(\left(\frac{2}{3}+\frac{1}{2}\right)\times\frac{9}{4}:2\)
= \(\frac{7}{6}\times\frac{9}{8}\)
= \(\frac{21}{16}\)
( 2 , 8 + 1 , 8 ) x 0 , 5 : 2
= 4 , 6 x 0 , 25
= 1 , 15
(2/3+1/2)*9/4:2
= 7/6 * 9/4 : 2
= 21/8 :2
= 21/16
Tính thuận tiện
a. 1/3 + 6/11 x 22/5 - 3/4 : 1,5
b. 3 x 3,5 x 6 + 2 x 6,4 x 9 + 1,8
\(a,\frac{1}{3}+\frac{6}{11}.\frac{22}{5}-\frac{3}{4}:1,5=\frac{1}{3}+\frac{6.2}{5}-\frac{3}{4}:\frac{3}{2}=\frac{1}{3}+\frac{12}{5}-\frac{1}{2}=\frac{10}{30}+\frac{72}{5}-\frac{15}{30}=\frac{67}{30}\)
\(b, 3.3,5.6+2.6,4.9+1,8=18.3,5+18.6,4+1,8=18\left(3,5+6,4\right)+1,8=18.9,9+1,8=1,8.99+1,8=1,8\left(1+99\right)=1,8.100=180\)
b ) 3 x 3,5 x 6 + 2 x 6,4 x 9 + 1,8
= 18 x 3,5 + 18x 6,4 + 18 x 0,1
= 18 ( 3,5 + 6,4 + 0,1)
= 18 x 10
= 180
Tính nhanh
a) A = (13,75 - 0,48 x 5) x (42,75 : 3 + 2,9) x (1,8 x 5 - 0,9 x 10)
b) B = (2001x2000+2000x1999)x(1+1/2+:1 1/2-1 1/3
0,9 x 2 + 1,8 x 3 + 2,7 x 4
Tìm x
\(a,3-x=x+1,8\)
\(b,2x-5=7x+35\)
\(c,2\left(x+10\right)=3\left(x-6\right)\)
\(d,8\left(x-\dfrac{3}{8}\right)+1=6\left(\dfrac{1}{6}+x\right)+x\)
\(e,\dfrac{2}{9}-3x=\dfrac{4}{3}-x\)
\(g,\dfrac{1}{2}x+\dfrac{5}{6}=\dfrac{3}{4}x-\dfrac{1}{2}\)
\(h,x-4=\dfrac{5}{6}\left(6-\dfrac{6}{5}x\right)\)
\(k,7x^2-11=6x^2-2\)
\(m,5\left(x+3.2^3\right)=10^2\)
\(n,\dfrac{4}{9}-(\dfrac{1}{6^2})=\dfrac{2}{3}\left(x-\dfrac{2}{3}\right)^2+\dfrac{5}{12}\)
\(a,3-x=x+1,8\)
\(\Rightarrow-x-x=1,8-3\)
\(\Rightarrow-2x=-1,2\)
\(\Rightarrow x=0,6\)
\(b,2x-5=7x+35\)
\(\Rightarrow2x-7x=35+5\)
\(\Rightarrow-5x=40\)
\(\Rightarrow x=-8\)
\(c,2\left(x+10\right)=3\left(x-6\right)\)
\(\Rightarrow2x+20=3x-18\)
\(\Rightarrow2x-3x=-18-20\)
\(\Rightarrow-x=-38\)
\(\Rightarrow x=38\)
\(d,8\left(x-\dfrac{3}{8}\right)+1=6\left(\dfrac{1}{6}+x\right)+x\)
\(\Rightarrow8x-3+1=1+6x+x\)
\(\Rightarrow8x-3=7x\)
\(\Rightarrow8x-7x=3\)
\(\Rightarrow x=3\)
\(e,\dfrac{2}{9}-3x=\dfrac{4}{3}-x\)
\(\Rightarrow-3x+x=\dfrac{4}{3}-\dfrac{2}{9}\)
\(\Rightarrow-2x=\dfrac{10}{9}\)
\(\Rightarrow x=-\dfrac{5}{9}\)
\(g,\dfrac{1}{2}x+\dfrac{5}{6}=\dfrac{3}{4}x-\dfrac{1}{2}\)
\(\Rightarrow\dfrac{1}{2}x-\dfrac{3}{4}x=-\dfrac{1}{2}-\dfrac{5}{6}\)
\(\Rightarrow-\dfrac{1}{4}x=-\dfrac{4}{3}\)
\(\Rightarrow x=\dfrac{16}{3}\)
\(h,x-4=\dfrac{5}{6}\left(6-\dfrac{6}{5}x\right)\)
\(\Rightarrow x-4=5-x\)
\(\Rightarrow x+x=5+4\)
\(\Rightarrow2x=9\)
\(\Rightarrow x=\dfrac{9}{2}\)
\(k,7x^2-11=6x^2-2\)
\(\Rightarrow7x^2-6x^2=-2+11\)
\(\Rightarrow x^2=9\Rightarrow\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)
\(m,5\left(x+3\cdot2^3\right)=10^2\)
\(\Rightarrow5\left(x+24\right)=100\)
\(\Rightarrow x+24=20\)
\(\Rightarrow x=-4\)
\(n,\dfrac{4}{9}-\left(\dfrac{1}{6^2}\right)=\dfrac{2}{3}\left(x-\dfrac{2}{3}\right)^2+\dfrac{5}{12}\)
\(\Rightarrow\dfrac{2}{3}\left(x-\dfrac{2}{3}\right)^2+\dfrac{5}{12}=\dfrac{4}{9}-\dfrac{1}{36}\)
\(\Rightarrow\dfrac{2}{3}\left(x-\dfrac{2}{3}\right)^2+\dfrac{5}{12}=\dfrac{5}{12}\)
\(\Rightarrow\dfrac{2}{3}\left(x-\dfrac{2}{3}\right)^2=0\)
\(\Rightarrow x-\dfrac{2}{3}=0\Rightarrow x=\dfrac{2}{3}\)
#\(Urushi\text{☕}\)
a: 3-x=x+1,8
=>-2x=-1,2
=>x=0,6
b: 2x-5=7x+35
=>-5x=40
=>x=-8
c: 2(x+10)=3(x-6)
=>3x-18=2x+20
=>x=38
d; 8(x-3/8)+1=6(1/6+x)+x
=>8x-3+1=1+6x+x
=>8x-2=7x+1
=>x=3
e: =>-3x+x=4/3-2/9
=>-2x=12/9-2/9=10/9
=>x=-5/9
g: =>3/4x-1/2x=5/6+1/2
=>1/4x=5/6+3/6=8/6=4/3
=>x=4/3*4=16/3
h: =>x-4=-x+5
=>2x=9
=>x=9/2
tim x
x - [ 3,3 + 2,4 ] = 11,6
[ x - 4,6 ] - 2,6 = 1,8
[ x + 1,8 ] -0,91 = 15,02
x.2 + x.4 = 9,84
100. [ x 1,8 ] = 456,3
47 - 5 . x = 27
x : 3 .4 = 1,248
8.x - 3 . x = 1,95
x: 2 - 8,6 = 2,43
x - ( 3,3 + 2,4 ) = 11,6
x - 5,7 =11,6
x = 11,6 + 5,7
x = 17,3
<=>x-5,7=11,6 <=>x-4,6=1,8+2,6
<=>x =11,6+5,7=17,3 <=>x-4,6=4,4
Vậy x=17,3 <=>x =4,4+4,6=9 Vậy x=9
<=>x+1,8=15,02+0,91=15,93 <=>5.x=47-27=20
<=>x =15,93-1,8=14,13 <=>x =20:5=4
Vậy x=14,13 Vậy x=4
<=>x:3=0,312 8.x-3.x=1,95
<=>x =0,312.3 x.5 =1,95
<=>x =0,931 x =1,95:5
Vậy x=0,936 x=0,19 vậy x=0,19
<=>x:2=2,43+8,6=11,03
<=>x =11,03.2= 22,06
Vậy x=22,06
tính :
( 2,7 + 1,8 ) * 2 * 1,5 =
\(\left(\frac{6}{5}x\frac{3}{4}\right)x2x\frac{2}{3}=\)
2,7 * 1,8 * 1,5 =
\(\frac{6}{5}x\frac{3}{4}x\frac{2}{3}=\)
16 * 16 * 6 =
câu 1=3,5
câu 2=6/5
câu 3=7,29
câu 4=3/5
câu 5=4096
(2,7+1,8)*2*1,5=4,5*2*1,5 =9*1,5 =13,5 (6/5*3/4)*2*2/3=9/10*2*2/3 =9/5*2/3 =6/5 2,7*1,8*1,5=7,29 6/5*3/4*2/3=3/5 16*16*6=1536