1 + 2,5 x 6 =
2
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a: =6-6=0
b: \(=\dfrac{-5}{4}:\dfrac{2-7}{8}+\dfrac{3}{2}\cdot\dfrac{2-5}{6}\)
\(=\dfrac{-5}{4}\cdot\dfrac{8}{-5}+\dfrac{3}{2}\cdot\dfrac{-3}{6}\)
\(=2+\dfrac{-9}{12}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
c: \(=2,5\cdot\left(-0,65\right)+1,5\left(-0,3-0,35\right)=-0,65\cdot4=-2,6\)
2 : x - 1,25 : x = 1,5
(2-1,25):x= 1,5
0,75 :x = 1,5
x= 0,75 : 1,5
x= 0,5
1,2 : x * 4 , 5 = 6
1,2 :x = 6 : 4,5
1,2 :x = 4/3
x= 1/2 : 4/3
x= 3/8
1,5 : 4,5 * x = 2,5
1/3x= 2,5
x= 2,5 : 1/3
x= 15/2
2:
a: =>x=1/2+1/6=3/6+1/6=4/6=2/3
b: =>x+3,5=7,8-6,3=1,5
=>x=1,5-3,5=-2
c: =>(35-x)/-105=1/5
=>35-x=-21
=>x=56
1
c hình như tính bình thường thôi:v
d
= 1,75 : 5 + 2,5 . (16 – 4 . 4,1)
= 1,75 : 5 + 2,5 . (16 – 16,4)
= 1,75 : 5 + 2,5 . (−0,4)
= 0,35 − 1
= −0,65.
2
a
\(\Rightarrow x=\dfrac{1}{2}+\dfrac{1}{6}=\dfrac{3}{6}+\dfrac{1}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)
b
\(\Rightarrow x+\dfrac{35}{10}=\dfrac{78}{10}-\dfrac{63}{5}:2\\ \Rightarrow x+\dfrac{35}{10}=\dfrac{78}{10}-\dfrac{63}{10}=\dfrac{15}{10}\\ \Rightarrow x=\dfrac{15}{10}-\dfrac{35}{10}=-2\)
c không rõ đề:v
Bài 1 : Tính :
a)\(\frac{6}{5}\)x 4,7 - 3,2
= 5,64 - 3,2
= 2,44
b) 17,6 x 6,7 + 3,2
= 117,92 + 3,2
= 121,12
Bài 2 :
a) 0,8 x 2,5 x 1,25
= ( 0,8 x 1,25 ) x 2,5
= 1 x 2,5
= 2,5
b) 4 x 5,6 x 2,5
= ( 4 x 2,5 ) x 5,6
= 10 x 5,6
= 56
c) 4,65 x 5,6 + 5,6 + 5,6 x 4,35
= 4,65 x 5,6 + 5,6 x 1 + 5,6 x 4,35
= 5,6 x ( 4,65 + 1 + 4,35 )
= 5,6 x 10
= 56
1.
\(\frac{6}{5}\)x \(4,7-3,2\)\(=5,64-3,2=2,44\)
\(17,6\)x \(6,7+3,2\)\(=117,92+3,2=121,12\)
2.
\(0,8\)x \(2,5\)x \(1,25\)\(=\)\(1,25\)x \(0,8\)x \(2,5\)\(=\)\(1\)x \(2,5\)\(=2,5\)
\(4\)x \(5,6\)x \(2,5\)\(=\)\(4\)x \(2,5\)x \(5,6\)\(=\)\(10\)x \(5,6\)\(=\)\(56\)
\(4,65\)x \(5,6\)+ \(5,6\)+ \(5,6\)x \(4,35\)= \(5,6\)x \(\left(4,65+1+4,35\right)\)= \(5,6\)x \(10\)= \(56\)
Nếu đúng thì cho mình 1 k mình nhé :)
Chúc bạn học tốt :)
2,5 x 6 + 3 x 2,5 + 2,5
= 2,5 x 6 + 3 x 2,5 + 2,5 x 1
= 2,5 x ( 6 + 3 + 1 )
= 2,5 x 10
= 25
1,
\(\dfrac{6}{7}\) + \(\dfrac{-5}{8}\) : (-5) -\(\dfrac{3}{16}\) . \(\left(-2\right)^2\)
= \(\dfrac{6}{7}\) + \(\dfrac{-5}{8}\) . \(\dfrac{-1}{5}\) - \(\dfrac{3}{16}\) . 4
= \(\dfrac{6}{7}\) + \(\dfrac{1}{8}\) - \(\dfrac{3}{4}\)
= \(\dfrac{48}{56}\) + \(\dfrac{7}{56}\) - \(\dfrac{42}{56}\)
= \(\dfrac{13}{56}\)
3,
a,\(\dfrac{3}{5}\)x - \(\dfrac{7}{10}\)x = \(\dfrac{-1}{2}\)
x.(\(\dfrac{3}{5}\) - \(\dfrac{7}{10}\)) = \(\dfrac{-1}{2}\)
x.\(\dfrac{-1}{10}\)= \(\dfrac{-1}{2}\)
x =\(\dfrac{-1}{2}\):\(\dfrac{-1}{10}\)
x = 5
c, (2,5x - 3,6) : \(\dfrac{15}{7}\) = -1
( \(\dfrac{5}{2}\)x - \(\dfrac{18}{5}\)) : \(\dfrac{15}{7}\) = -1
\(\dfrac{5}{2}\)x - \(\dfrac{18}{5}\) = -1 . \(\dfrac{15}{7}\)
\(\dfrac{5}{2}\)x - \(\dfrac{18}{5}\) = \(\dfrac{-15}{7}\)
\(\dfrac{5}{2}\)x = \(\dfrac{-15}{7}\) + \(\dfrac{18}{5}\)
\(\dfrac{5}{2}\)x = \(\dfrac{51}{35}\)
x =\(\dfrac{51}{35}\) : \(\dfrac{5}{2}\)
x = \(\dfrac{102}{175}\)
Mình không biết có chỗ nào sai không nữa.
a) x/7 = 6/21
x/7 = 2/7
=>x=2
b)2/3x -1/2=1/10
2/3x = 1/10+1/2
2/3x = 3/5
x=3/5:2/3
x=9/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5
c: Ta có: \(\dfrac{1}{3}-\dfrac{7}{8}x=\dfrac{1}{4}\)
\(\Leftrightarrow x\cdot\dfrac{7}{8}=\dfrac{1}{12}\)
\(\Leftrightarrow x=\dfrac{1}{12}\cdot\dfrac{8}{7}=\dfrac{2}{21}\)
d: Ta có: \(\dfrac{3}{2}x+\dfrac{1}{7}=\dfrac{7}{8}\cdot\dfrac{64}{49}\)
\(\Leftrightarrow x\cdot\dfrac{3}{2}=1\)
hay \(x=\dfrac{2}{3}\)
=1/2 + 15
= 0,5 + 15
= 15,5
1/2+2,5x6
=0,5+0,5x5 x 6
=0,5x(1+5x6)
=0,5x31
=15,5