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(-5/4x+3,25)[3/5-(-5/2x)]=0
=>-5/4x+3,25 = 0 hoặc 3/5-(-5/2x)=0
=>+)-5/4x+3,25 = 0
=>-5/4x =-3,25
=>x= -2,6
+)3/5-(-5/2x)=0
=>3/5+5/2x=0
5/2x = -3/5
=> x= -0,24.
\(3,25.\left(-\frac{4}{3}\right)^2-1\frac{1}{3}.2005^0.\left|-2+\frac{2}{3}\right|\)
\(=\frac{13}{4}.\frac{16}{9}-\frac{4}{3}.1.\left|-\frac{4}{3}\right|\)
\(=\frac{13}{4}.\frac{16}{9}-\frac{4}{3}.1.\frac{4}{3}\)
\(=\frac{52}{9}-\frac{4}{3}.\frac{4}{3}\)
\(=\frac{52}{9}-\frac{16}{9}\)
\(=\frac{52-16}{9}\)
\(=\frac{36}{9}\)
\(=4.\)
\(\left(3,25-\frac{2}{3}x\right):\left(\frac{-7}{4}\right)=-3\)
\(\left(\frac{14}{3}-\frac{2}{3}x\right):\left(\frac{-7}{4}\right)=-3\)
\(\frac{14}{3}-\frac{2}{3}x=\left(-3\right).\left(\frac{-7}{4}\right)\)
\(\frac{14}{3}-\frac{2}{3}x=\frac{21}{4}\)
\(-\frac{2}{3}x=\frac{21}{4}-\frac{14}{3}\)
\(-\frac{2}{3}x=\frac{7}{12}\)
\(x=\frac{7}{12}:\left(-\frac{2}{3}\right)\)
\(x=-\frac{7}{8}\)
\(PT\Leftrightarrow3,25-\frac{2}{3}x=\left(-3\right).\left(\frac{-7}{4}\right)\)
\(\Leftrightarrow3,25-\frac{2}{3}x=\frac{21}{4}\)
\(\Leftrightarrow\frac{2}{3}x=3,25-\frac{21}{4}\)
\(\Leftrightarrow\frac{2}{3}x=-2\)
\(\Leftrightarrow x=\left(-2\right).\frac{3}{2}\)
\(\Leftrightarrow x=-3\)
\(x+\left(2+\frac{1}{3}\right).x-3,25.x=62,5\%\)
\(x.\left(1+2+\frac{1}{3}-3,25\right)=\frac{5}{8}\)
\(x.\frac{1}{12}=\frac{5}{8}\)
\(x=\frac{5}{8}:\frac{1}{12}\)
\(x=\frac{15}{2}\)
Chúc bn học tốt !!!!
1) <=> 8x-16-21-7x=-4
<=> x-37=-4
<=> x=33
2) <=> 12x-48+6x-12-16x-48=-28
<=> 2x-108=-28
<=> 2x = 80
<=> x = 40
3)<=> 4x-20-35+7x+50-10x=-3
<=> x-5=-3
<=> x=2
4) <=> -3x-15=-45-21
<=> 51=3x
<=> 17=x
5) 4x-28+15=-2x+14-10
<=> 6x-13=4
<=> 6x=17
<=> x = \(\frac{17}{6}\)
Chúc bạn học tốt
(x-1/2).5/3=7/4-1/2
(x-1/2).5/3=5/4
x-1/2=5/4:5/3
x=3/4+1/2
x=5/4
(x-4/3).7/4=5-7/6
(x+4/3).7/4=23/6
x+4/3=23/6:7/4
x+4/3=46/21
x=46/21-4/3
x=6/7
\(a,2.\left(x-5\right)-3.\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(x=-31-14\)
\(x=-45\)
\(b,5.\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36=12\)
\(3x=12+36\)
\(3x=48\)
\(x=16\)
\(c,-5.\left(2-x\right)+4.\left(x-3\right)=10.x-15\)
\(-10+5x+4x-12=10x-15\)
\(-6x-22=10x-15\)
\(-6x-10x=-15+22\)
\(-16x=7\)
\(x=-\frac{7}{16}\)
Câu d , e f tương tự nha