y : 26 - 157 = 4161
y : 26 = 4161 + 157 
y : 26 = 4318
y = 4318 * 26
y = 112268

a) 175+x*12=10175

         x*12=10175-175

        x*12=10000

        x     =10000/12

         x    =833.333...

b) x/26-157=14161

    x/26      =14161+157

   x/26      =14318

     x        =14318*26

     x        =372268

tranquynhnga

175 + 12x = 10175

12x = 10000

x = 10000/12 

x = 2500/3

x/26 - 157 =14161

x/26 = 14318

x = 14318 . 26

x = 372268

169.(157-77.x)^2 + 100.(201-100.x)^2 = 26.(77.x-157).(1000.x-2010) (1)
169.(157-77.x)^2 = (13 .(157-77.x)) ^2
100.(201-100.x)^2 = ( 2010- 1000x)^2
26.(77.x-157).(1000.x-2010) = 26.(157-77.x)( 2010- 1000x)
=> (1) <=> (13 .(157-77.x)) ^2 + ( 2010- 1000x)^2 - 26.(157-77.x)( 2010- 1000x) =0
<=> [ 13(157-77.x) - ( 2010- 1000x)]^2 =0 <=> 13(157-77.x) - ( 2010- 1000x) = 0

=> 2041-1001x-2010+1000x=0=>x=31

Tỉ số % của 810 và 4161 là :

             810 : 4161 = 0,1946...=19,46 %

              Đáp số : 19,46%

sao mà đặt đc

= 19,5 %

71–(–30)–37 – 81 + 37

=71+30-37-81+37

=(71+30)+(-37+37)-81

=101+0-81

=20

(–56) + 26 + 14 + 56

=(-56+56)+(26+14)

=0+40

=40

1632 –37– (– 157) – 163 – 1532

=(1632-1532)+(-37+157)-163

=1100+120-163

=1220-163

=1057

(24 + 157 + 26) - (57 + 50)

= 24 + 157 + 26 - 57 - 50

= (24 + 26 - 50) + (157 - 57)

= 0 + 100

= 100

=24+157+26+57-50

=(24+26)+(157-57)+50

=50+100+50

=200

 cho mink nha !

2: \(x^2-2xy+y^2-2x+2y\)

\(=\left(x-y\right)^2-2\left(x-y\right)\)

=(x-y)(x-y-2)

3: \(3x^2-2x-5\)

\(=3x^2-5x+3x-5\)

=x(3x-5)+(3x-5)

=(3x-5)(x+1)

4: \(16-x^2+4xy-4y^2\)

\(=16-\left(x^2-4xy+4y^2\right)\)

\(=4^2-\left(x-2y\right)^2\)

=(4-x+2y)(4+x-2y)

5: \(x^2-2x+1-y^2\)

\(=\left(x-1\right)^2-y^2\)

=(x-1-y)(x-1+y)

6: \(x^2+8x+15\)

\(=x^2+3x+5x+15\)

=x(x+3)+5(x+3)

=(x+3)(x+5)

7: \(\left(x^2+6x+8\right)\left(x^2+14x+48\right)-9\)

=(x+2)(x+4)(x+6)(x+8)-9

\(=\left(x^2+10x+16\right)\left(x^2+10x+24\right)-9\)

\(=\left(x^2+10x\right)^2+40\left(x^2+10x\right)+384-9\)

\(=\left(x^2+10x\right)^2+15\left(x^2+10x\right)+25\left(x^2+10x\right)+375\)

\(=\left(x^2+10x+25\right)\left(x^2+10x+15\right)=\left(x+5\right)^2\cdot\left(x^2+10x+15\right)\)

8: \(\left(x^2-8x+15\right)\left(x^2-16x+60\right)-24x^2\)

\(=\left(x-3\right)\left(x-5\right)\left(x-6\right)\left(x-10\right)-24x^2\)

\(=\left(x^2-13x+30\right)\left(x^2-11x+30\right)-24x^2\)

\(=\left(x^2+30\right)^2-24x\left(x^2+30\right)+143x^2-24x^2\)

\(=\left(x^2+30\right)^2-24x\left(x^2+30\right)+119x^2\)

\(=\left(x^2-7x+30\right)\left(x^2-17x+30\right)\)

\(=\left(x^2-7x+30\right)\left(x-2\right)\left(x-15\right)\)