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* Trả lời:
\(\left(1\right)\) \(-3\left(1-2x\right)-4\left(1+3x\right)=-5x+5\)
\(\Leftrightarrow-3+6x-4-12x=-5x+5\)
\(\Leftrightarrow6x-12x+5x=3+4+5\)
\(\Leftrightarrow x=12\)
\(\left(2\right)\) \(3\left(2x-5\right)-6\left(1-4x\right)=-3x+7\)
\(\Leftrightarrow6x-15-6+24x=-3x+7\)
\(\Leftrightarrow6x+24x+3x=15+6+7\)
\(\Leftrightarrow33x=28\)
\(\Leftrightarrow x=\dfrac{28}{33}\)
\(\left(3\right)\) \(\left(1-3x\right)-2\left(3x-6\right)=-4x-5\)
\(\Leftrightarrow1-3x-6x+12=-4x-5\)
\(\Leftrightarrow-3x-6x+4x=-1-12-5\)
\(\Leftrightarrow-5x=-18\)
\(\Leftrightarrow x=\dfrac{18}{5}\)
\(\left(4\right)\) \(x\left(4x-3\right)-2x\left(2x-1\right)=5x-7\)
\(\Leftrightarrow4x^2-3x-4x^2+2x=5x-7\)
\(\Leftrightarrow-x-5x=-7\)
\(\Leftrightarrow-6x=-7\)
\(\Leftrightarrow x=\dfrac{7}{6}\)
\(\left(5\right)\) \(3x\left(2x-1\right)-6x\left(x+2\right)=-3x+4\)
\(\Leftrightarrow6x^2-3x-6x^2-12x=-3x+4\)
\(\Leftrightarrow-15x+3x=4\)
\(\Leftrightarrow-12x=4\)
\(\Leftrightarrow x=-\dfrac{1}{3}\)
Đề bài là gì bạn , chẳng nhẽ tính ?
a) (9x + 1) - (4x + 2) = 9x + 1 - 4x - 2 = (9x - 4x) + (1 - 2) = 5x - 1
b) (3x3 + 1) - (3x2 - 4x + 5) = 3x3 + 1 - 3x2 + 4x - 5 = 3x3 - 3x2 + 4x + (1 - 5) = 3x3 - 3x2 + 4x - 4
a) \(\left(9x+1\right)-\left(4x+2\right)\)
\(=9x+1-4x-2\)
\(=5x-1\)
b) \(\left(3x^2+1\right)-\left(3x^2-4x+5\right)\)
\(=3x^2+1-3x^2+4x-5\)
\(=4x-4\)
A) 5/4+x=2/3
B) -x-2=5/4
C)4x+1/3=3/2
Đ) 1/3-2/5+3x=3/4
E) 3x+7+2x=4x-3
G) 3x(2x-3)-2x(3x-4)=15
H) x^2-x=0
a) \(x=-\frac{7}{12}\)
b) \(x=-\frac{13}{4}\)
c) \(x=\frac{7}{24}\)
d) \(x=\frac{49}{180}\)
e) \(x=-10\)
g) \(x=15\)
h) \(\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
P = \(\dfrac{3x+2}{4x-5}\) Đk \(x\ne\) \(\dfrac{5}{4}\)
P \(\in\) Z ⇔ 3\(x\) + 2 ⋮ 4\(x\) - 5
(3\(x\) + 2).4 ⋮ 4\(x\) - 5
12\(x\) + 8 ⋮ 4\(x\) - 5
3.(4\(x\) - 5) + 23 ⋮ 4\(x\) - 5
23 ⋮ 4\(x\) - 5
4\(x\) - 5 \(\in\) Ư(23) = {-23; -1; 1; 23}
\(x\) \(\in\) {- \(\dfrac{9}{2}\); 1; \(\dfrac{3}{2}\); 7}
Vì \(x\in\) Z nên \(x\) \(\in\) {1; 7}