Question

rút gọn biểu thức:

2x-3(x-1)-5[x-4(3-2x)+10].(-2x)

Answer 1

2x-3(x-1)-5(x-4(3-2x)+10)(-2x)

=2x-3x+3-5(x-12+8x+10)(-2x)

=-x+3-5(-2x²+24x-16x²-20x)

=-x+3-(-10x²+120x-80x²-100x)

=-x+3+10x²-120x+80x²+100x

=90x²-21x+3

Answer 2

2x - 3( x - 1 ) - 5[ x - 4( 3 - 2x ) + 10 ].(-2x)

= 2x - 3x + 3 + 10x[ x - 12 + 8x + 10 ]

= -x + 3 + 10x[ 9x - 2 ]

= -x + 3 + 90x² - 20x

= 90x² - 21x + 3 

Answer 3

\(=2x-3x+3-5\left[x-12+8x+10\right]\left(-2x\right)\) 

\(=-x+3+10x\left(9x-2\right)\) 

\(=-x+3+90x^2-20x\) 

\(=90x^2-21x+3\)

Answer 4

\(2x-3\left(x-1\right)-5\left[x-4\left(3-2x\right)+10\right]\left(-2x\right)\)

\(=2x-3x+3-5\left[x-12+8x+10\right]\left(-2x\right)\)

\(=-x+3+10x\left[9x-2\right]\)

\(=-x+3+90x^2-20x\)

\(=90x^2-21x+3\)

Answer 5

              Bài làm :

Ta có :

\(2x-3\left(x-1\right)-5\left[x-4\left(3-2x\right)+10\right].\left(-2x\right)\)

\(=2x-3x+3-5\left[x-12+8x+10\right].\left(-2x\right)\)

\(=-x+3+10x\left[9x-2\right]\)

\(=-x+3+90x^2-20x\)

\(=90x^2-21x+3\)