Tìm x
1/3 x X - 0,5 x X = 0,75
Bài 3: Tìm x
a) X : 0,25 + X × 0,25 = 3,4 b) 0,7 : X + 0,5 : X = 0,75
x:0,25 + X x0,25=3,4
(0,25+0,25) :x=3,4
0,5:x=3,4
x=3,4:0,5
x=6,8
a) \(x:0,25+x.0,25=3,4\)
\(\Leftrightarrow x:\dfrac{1}{4}+\dfrac{1}{4}x=3,4\)
\(\Leftrightarrow4x+\dfrac{1}{4}x=3,4\Leftrightarrow\dfrac{17}{4}x=3,4\Leftrightarrow x=3,4:\dfrac{17}{4}\)
\(\Leftrightarrow x=0,8\)
b) \(0,7:x+0,5:x=0,75\)
<=> \(\left(0,7+0.5\right):x=0,75\)
<=> \(1,2:x=0,75\)
<=> \(x=1,6\)
Tìm X :
X : 0,5 + X x 0,5 = 0,75
jup mình nha . ai xong đầu tick 3 cái
\(x:0,5+x\times0,5=0,75\)'
\(\Rightarrow x:\frac{5}{10}+x\times\frac{5}{10}=\frac{3}{4}\)
\(\Rightarrow\frac{10x}{5}+\frac{5x}{10}=\frac{3}{4}\)
\(\Rightarrow2x+\frac{5x}{10}=\frac{3}{4}\)
\(\Rightarrow\frac{40x}{20}+\frac{10x}{20}=\frac{15}{20}\)
\(\Rightarrow50x=15\Rightarrow x=0,3\)
x/0.5+x*0.5=0.75
x*2+x*0.5=0.75
x*2.5=0.75
x=0.75/2.5
x=0.3
Tìm X
X : 0,5 + X x 0,5 = 0,75
x/0,5+x*0,5=0,75
x*2+x*0,5=0,75
x*(2+0.5)=0,75
x*2,5=0.75
x=0,75/2,5
x=0,3
0,3
Ai tick mình đi mình cần 10 cái!!!!!!
tìm x:
a) 1/2.x+3/5.(x-2)= 3
b)1/3.x-0,5.x= 0,75
c)3/-2.x-0,5.x=75%
d)-2/5.x+1/4=75%-3/4.x
a) \(\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
0,5 x + 0,6 ( x - 2 ) = 3
0,5 x + 0.6 x - 1,2 = 3
1,1 x = 4,2
x = \(\frac{42}{11}\)
Kết luận:
b) \(\frac{1}{3}x-0,5x=0,75\)
\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(-\frac{1}{6}x=\frac{3}{4}\)
\(x=-\frac{9}{2}\)
Kết luận:
c) \(\frac{3}{-2}x-0,5x=75\%\)
-1,5x - 0,5x = 0,75
-2x = 0,75
x = -0,375
Kết luận:
d) \(-\frac{2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
-0,4 x + 0,25 = 0,75 - 0,75 x
-0,4 x + 0,75 x = 0,75 - 0,25
0,35 x = 0,5
x = \(\frac{10}{7}\)
Kết luận:
\(a,\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
\(\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)
\(\left(\frac{1}{2}+\frac{3}{5}\right)x-\frac{6}{5}=3\)
\(\frac{11}{10}x-\frac{6}{5}=3\)
\(\frac{11}{10}x=\frac{21}{5}\)
\(x=\frac{42}{11}\)
\(b,\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(\left(\frac{1}{3}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(\frac{-1}{6}x=\frac{3}{4}\)
\(x=\frac{-9}{2}\)
\(c,\frac{3}{-2}x-\frac{1}{2}x=75\%\)
\(\left(\frac{3}{-2}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(-2x=\frac{3}{4}\)
\(x=\frac{-3}{8}\)
\(\frac{-2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
\(\frac{-2}{5}x+\frac{3}{4}x=\frac{3}{4}-\frac{1}{4}\)
\(\left(\frac{-2}{5}+\frac{3}{4}\right)x=\frac{1}{2}\)
\(\frac{7}{20}x=\frac{1}{2}\)
\(x=\frac{10}{7}\)
Tìm x, biết:
a) \(\left(\dfrac{3}{4}.x+2\dfrac{1}{2}\right).\dfrac{-2}{3}=\dfrac{1}{8}\)
b) \(\dfrac{1}{3}.x-0,5.x=0,75\)
a: \(\left(\dfrac{3}{4}x+2\dfrac{1}{2}\right)\cdot\dfrac{-2}{3}=\dfrac{1}{8}\)
=>\(\left(\dfrac{3}{4}x+\dfrac{5}{2}\right)=\dfrac{1}{8}:\dfrac{-2}{3}=\dfrac{-3}{16}\)
=>\(\dfrac{3}{4}x=-\dfrac{3}{16}-\dfrac{5}{2}=-\dfrac{3}{16}-\dfrac{40}{16}=-\dfrac{43}{16}\)
=>\(x=-\dfrac{43}{16}:\dfrac{3}{4}=\dfrac{-43}{16}\cdot\dfrac{4}{3}=\dfrac{-43}{12}\)
b: \(\dfrac{1}{3}\cdot x-0,5x=0,75\)
=>\(x\left(\dfrac{1}{3}-\dfrac{1}{2}\right)=0,75\)
=>\(x\cdot\dfrac{-1}{6}=0,75\)
=>\(x=-0,75\cdot6=-4,5\)
Tính bằng cách thuận tiện
0,75+1,5×97,8×0,5+0,25×3×1,2
Tính bằng cách thuận tiện
0,75 + 1,5 Nhân 97,8 x 0,5 + 0,25 x 3 x 1,2
0,75 + 1,5 \(\times\) 97,8 \(\times\) 0,5 + 0,25 \(\times\) 3 \(\times\) 1,2
= 0,75 \(\times\) 1 + (1,5 \(\times\) 0,5)\(\times\) 97,8 + (0,25 \(\times\)3) \(\times\) 1,2
= 0,75 \(\times\) 1 + 0,75 \(\times\) 97,8 + 0,75 \(\times\) 1,2
= 0,75 \(\times\) ( 1 + 97,8 + 1,2)
= 0,75 \(\times\) [1 + ( 97,8 + 1,2)]
= 0,75 \(\times\) [1 + 99]
= 0,75 \(\times\) 100
= 75
1, Tìm x
a, X : 0,25 + X x 0,25 = 3,4
b, 0,7 : X = 0,75 - 0,5 : X
Tìm x
\(\frac{1}{3}\). x - 0,5 . x = 0,75
\(\frac{1}{3}x-0,5x=0,75\)
\(\Rightarrow-\frac{1}{6}x=0,75\)
\(\Rightarrow x=-\frac{9}{2}\)
\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(\left(\frac{1}{3}+\frac{1}{2}\right)x=\frac{3}{4}\)
\(\frac{5}{6}x=\frac{3}{4}\)
\(x=\frac{3}{4}\div\frac{5}{6}\)
\(x=\frac{3}{4}\cdot\frac{6}{5}=\frac{9}{10}\)
\(#Cothanhkhe\)
\(\frac{1}{3}.x-0,5.x=0,75\)
\(\frac{1}{3}.x-\frac{1}{2}.x=\frac{3}{4}\)
\(x.\left(\frac{1}{3}-\frac{1}{2}\right)=\frac{3}{4}\)
\(x.\left(\frac{2}{6}-\frac{3}{6}\right)=\frac{3}{4}\)
\(x.\frac{-1}{6}=\frac{3}{4}\)
\(x=\frac{3}{4}:\frac{-1}{6}\)
\(x=\frac{-9}{2}\)