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-1/2.3x+3/4=-2.25
-1/2.3x+3/4=9/4
-1/2.3x =9/4-3/4
-1/2.3x =3/2
3x =3/2:-1/2
3x =-3
x =-3:3
x =-1
vậy x=-1
\(-\frac{1}{2}.3x+\frac{3}{4}=-2,25\)
\(\Rightarrow\frac{1}{2}.(-3).x+\frac{1}{2}.\frac{3}{2}=\frac{9}{4}\)
\(\Rightarrow\frac{1}{2}.\left(-3x+\frac{3}{2}\right)=\frac{9}{4}\)
\(\Rightarrow-3x+\frac{3}{2}=\frac{9}{4}:\frac{1}{2}\)
\(\Rightarrow-3x+\frac{3}{2}=\frac{9}{2}\)
\(\Rightarrow-3x=3\)
\(\Rightarrow x=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ý cậu là này à:
\(\frac{2,56\times0,44\times2,25}{3,2\times0,12\times0,6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7,1 + (-5,25)-(-2,25+7,1)
= 7,1 + ( -5,25 ) + 2,25 + 7,1
= 7,1 + (-3) + 7,1
= 11,2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2x+25\%x=-2,25\)
\(\Leftrightarrow2x+\frac{25}{100}x=-\frac{225}{100}\)
\(\Leftrightarrow2x+\frac{1}{4}x=-\frac{9}{4}\)
\(\Leftrightarrow x\left(2+\frac{1}{4}\right)=-\frac{9}{4}\)
\(\Leftrightarrow\frac{9}{4}x=-\frac{9}{4}\)
\(\Leftrightarrow x=-\frac{9}{4}\div\frac{9}{4}\)
\(\Leftrightarrow x=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 2,25 x ( 48 : 0,125)
= 2,25 x 384
= 864