(-1,5). -2/3 + (2,5-3/4):7/4
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\(\left(x+2,5\right):2\frac{1}{2}-1,5=-1\frac{1}{4}\\ \left(x+2,5\right):2,5=-1\frac{1}{4}+1,5\\ x:2,5+1=\frac{-1}{4}\\ x:\frac{5}{2}=\frac{-5}{4}\\ x=\frac{-1}{2}\)
mik biết làm e hk hak
e, = 3,5-(-1):(-0,5)
= 3,5 - 2
= 1.5
\(\left(3-\frac{2}{3}+\frac{4}{3}\right):\left(2\frac{1}{3}-2,5\right)^2\)
\(=\left(\frac{7}{3}+\frac{4}{3}\right):\left(2\frac{1}{3}-2\frac{1}{2}\right)^2\)
\(=\frac{11}{3}:\left(-\frac{1}{6}\right)^2\)
\(=\frac{11}{3}:\frac{1}{36}\)
\(=\frac{11}{3}x\frac{36}{1}\)
\(=\frac{396}{3}\)
\(=132\)
1) \(|5x-3|=|7-x|\)
\(\Leftrightarrow\orbr{\begin{cases}5x-3=7-x\\5x-3=x-7\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}6x=10\\4x=-4\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{5}{3}\\x=-1\end{cases}}\)
Vậy...
2) \(2.|3x-1|-3x=7\)
\(\Leftrightarrow2.|3x-1|=7+3x\)
\(\Leftrightarrow\orbr{\begin{cases}2.\left(3x-1\right)=7+3x\\2.\left(3x-1\right)=-7-3x\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}6x-2=7+3x\\6x-2=-7-3x\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}3x=9\\9x=-5\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=3\\x=\frac{-5}{9}\end{cases}}\)
Vậy...
A,\(4,5\times2+1,8\div3\)\(=9+0,6\)\(=9,6\)
B,\(\left(2,5+1,5\right)+92\)\(=4+92\)\(=96\)
C,\(\left(2,5-1,5\right):0.5\times2,8\)\(=1\div0,5\times2,8\)\(=2\times2,8=5,6\)
D,\(48,5-\left(2,3+1,7\right)\times1,3\)\(=48,5-4\times1,3\)\(=48,5-5,2\)\(=43,3\)
a) 1/2x - 2/3x = 7/12
-1/6x = 7/12
x = \(\frac{7}{12}\div\frac{-1}{6}\)
x = -7/2
b) x: 12 = -2,5
x = -2,5*12
x = -30
c) 11/2x = 13/15
x = 13/15:11/2
x = 26/165
d) 3x/7 + 1 = (-1/28)*(-4)
3x/7 + 1 = 1/7
3x/7 = 1/7 - 1
3x/7 = -6/7
3x = -6
x= -6/3
x= -2
a) x(0.5 - 2/3 ) = 7/12
(-1/6)x = 7/12
x = 7/12 : (-1/6)
x =-7/2
b) x : 12 = -2,5
x= -2.5 * 12 =-30
c) x = 13/15 : 5,5
x =26/125
d) 3x/7 + 1 = -1/28 * (-4)
3x/7 + 1 =1/7
3x/7 = 1/7 -1
3x/7 =-6/7
3x =-6/7 * 7
3x = -6
x =-2
hsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
bài làm
a) 2,5:x+1,5:x=100
2,5+1,5:x=100
4 :x=100
x=100:4
x=25
vậy x=25
b) \(\frac{5}{6}-x=\frac{5}{12}+\frac{1}{3}\)
\(\frac{5}{6}-x=\frac{5}{12}+\frac{4}{12}\)
\(\frac{5}{6}-x=\frac{9}{12}\)
\(x=\frac{5}{6}-\frac{9}{12}\)
\(x=\frac{10}{12}-\frac{9}{12}\)
\(x=\frac{1}{12}\)
vậy \(x=\frac{1}{12}\)
chúc bạn học tốt
2,5 : x + 1,5 : x = 100
\(\frac{2,5}{x}+\frac{1,5}{x}=100\)
\(\frac{2,5+1,5}{x}=100\)
\(\frac{4}{x}=100\)
x = 4 : 100 = 0,04