a. x:(1/2+2/3)=6/5
=>x:7/6=6/5
=>x=6/5*7/6=>x=7/5
b.(x-1/2)-5(x-2/3)=3/2x
=>x-1/2-5x+10/3=3/2x
=>-4x+17/6=3/2x
=>17/6x=3/2x--4x
=>17/6=x(3/2+4)=>17/6=11/2x=>x=17/33
c.-5(x+1/5)-1/2(x-2/3)=x
=>-5x-1-1/2x+1/3=x=>-11/2x-2/3=x
=>-2/3=x+11/2x=>-2/3=x(1+11/2)=>-2/3=13/2x
=>x=-4/39
a) x : (1/2 + 2/3) = 6/5
=> x : 7/6 = 6/5
=> x = 6/5 x 7/6
x = 7/5
b) , c) ko bít hihi
a) \(x:\left(\frac{1}{2}+\frac{2}{3}\right)=\frac{6}{5}\)
\(x:\frac{7}{6}=\frac{6}{5}\)
x=6/5 . 7/6=7/5
b)\(\left(x-\frac{1}{2}\right)-5\left(x-\frac{2}{3}\right)=\frac{3}{2}x\)
\(x-\frac{1}{2}-5x+5.\frac{2}{3}=\frac{3}{2}x\)
\(x-5x-\frac{3}{2}x=\frac{1}{2}-\frac{10}{3}\)
x(1-5-3/2)=-17/6
x. -11/2=-17/6
x=17/33 ( tự làm phép chia nha)
c) mình ghi bài làm luôn
-5x+ (-5).1/5-1/2x+1/2.2/3=x
-5x+(-1)-1/2x+1/3=x
(-1)+1/3=x+5x+1/2x
-2/3=x(1+5+1/2)
-2/3=x.13/2
x=-2/3: 13/2
x= -4/39
Mấy bài này y hệt trong đề cương của mình
