Đề thi học kì 1 - Toán 8 Trường THCS Diễn Lâm - Nă...

A $a, 5x\left( {x-2} \right)$

$b,\left( {x - y} \right)\left( {x + y-2} \right)$

$c, 4\left( {x - 2y} \right)\left( {x + y} \right)$

B $a, 5x\left( {x+2} \right)$

$b,\left( {x - y} \right)\left( {x + y-2} \right)$

$c, 4\left( {x - 2y} \right)\left( {x + y} \right)$

C $a, 5x\left( {x-2} \right)$

$b,\left( {x - y} \right)\left( {x - y-2} \right)$

$c, 4\left( {x - 2y} \right)\left( {x + y} \right)$

D $a, 5x\left( {x-2} \right)$

$b,\left( {x - y} \right)\left( {x + y-2} \right)$

$c, 4\left( {x - 2y} \right)\left( {x - y} \right)$

A 1.  $a) 15{{x}^{2}}+10x$

$b) 4{{x}^{2}}y-2x+\frac{1}{2}$

2. $a)  x=4$ hoặc $x=-4$ 

$b, x=2$

B 1.  $a) 15{{x}^{2}}-10x$

$b) 4{{x}^{2}}y-2x+\frac{1}{2}$

2. $a)  x=4$ hoặc $x=-4$ 

$b, x=2$

C 1.  $a) 15{{x}^{2}}-10x$

$b) 4{{x}^{2}}y-2x+\frac{1}{2}$

2. $a)  x=4$ hoặc $x=-4$ 

$b, x=1$

D 1.  $a) 15{{x}^{2}}-10x$

$b) 4{{x}^{2}}y-2x+\frac{1}{2}$

2. $a)  x=4$ 

$b, x=-2$

A $a,\ a\ne \pm 2$

$b,\ P = \frac{{2a}}{{a + 1}}$

$c,\ a\in \left\{ -3;-2;0 \right\}$

B $a,\ a\ne \pm 1$

$b,\ P = \frac{{2a}}{{a - 1}}$

$c,\ a\in \left\{ -3;-2;0 \right\}$

C $a,\ a\ne \pm 1$

$b,\ P = \frac{{2a}}{{a + 1}}$

$c,\ a\in \left\{ -3;-2;0 \right\}$

D $a,\ a\ne \pm 1$

$b,\ P = \frac{{2a}}{{a - 1}}$

$c,\ a\in \left\{ 3;-2;0 \right\}$

A $M=1$

B $M=-1$

C $M=2$

D $M=3$